@article{DrenckhahnWeber2020, author = {Drenckhahn, Detlev and Weber, Heinrich E.}, title = {Die Nordfriesische Brombeere, Rubus boreofrisicus Drenckhahn \& H. E. Weber, eine endemische Rubus-Art der Westk{\"u}ste von Schleswig-Holstein, Deutschland}, series = {Forum geobotanicum}, volume = {9}, journal = {Forum geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2020.0116}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-198194}, pages = {66-69}, year = {2020}, abstract = {Rubus boreofrisicus Drenckhahn \& H. E.Weber ist eine bisher unbeschriebene Rubus-Art der Untergattung Rubus, Serie Discolores. Die Endbl{\"a}ttchen der 5-z{\"a}hligen, handf{\"o}rmigen Sch{\"o}sslingsbl{\"a}tter sind breit eif{\"o}rmig bis ann{\"a}hernd rund, unterseits grau-weißlich, oberseits dunkelgr{\"u}n und schwach behaart. Die Sch{\"o}sslinge sind braunrot, kantig bis schwach gefurcht, etwas behaart mit geraden bis schwach gekr{\"u}mmten, 5-8 mm langen, braunroten Stacheln mit heller Spitzenh{\"a}lfte. Die Bl{\"u}tenstiele besitzen Stieldr{\"u}sen. Rubus boreofrisicus kommt h{\"a}ufig im Waldg{\"u}rtel und in der angrenzenden D{\"u}nenheide der nordfriesischen Insel Amrum vor und ist auch 50 km s{\"u}dlich von Amrum in St. Peter-Ording im Westen der Halbinsel Eiderstedt vertreten.}, subject = {Rubus}, language = {de} } @article{DrenckhahnBaumgartnerZonneveld2017, author = {Drenckhahn, Detlev and Baumgartner, Werner and Zonneveld, Ben}, title = {Different genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution}, series = {Forum Geobotanicum}, volume = {7}, journal = {Forum Geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2017.1122}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-155061}, pages = {27-33}, year = {2017}, abstract = {The genus Ficaria is now considered to comprize eight Eurasian species. The most widespread European species is the tetraploid F. verna Huds. The present study provides evidence for the existence of two main lineages of F. verna that differ considerably in their genomic size by about 3 pg. A Western F. verna lineage west of river Rhine displays a mean genome size (2C-value) of 34.2 pg and is almost precisely codistributed with the diploid F. ambigua Boreau (20 pg) north of the Mediterranean. The remaining part of Europe appears to be occupied by the Eastern F. verna lineage solely (mean genome size of 31.3 pg) which codistributes in South-Eastern Europe with the diploid F. calthifolia Rchb. (15 pg). There is little overlap at the boundary of Western and Eastern F. verna lineages with the occurrence of a separate intermediate group in the Netherlands (mean genomic size of 33.2 pg) that appears to result from hybridization of both lineages. On the basis of these observations and further considerations we propose development of F. ambigua and F. calthifolia south of the Alps with subsequent divergence to populate their current Western and Eastern European ranges, respectively. The Western F. verna lineage is proposed to originate from autotetraploidization of F. ambigua (precursor) with moderate genomic downsizing and the Eastern F. verna lineage from auto¬tetraploidization of F. calthifolia (precursor).}, subject = {Durchflusscytometrie}, language = {en} } @article{GottschlichDrenckhahnMeierottetal.2023, author = {Gottschlich, G{\"u}nter and Drenckhahn, Detlev and Meierott, Lenz and Zonneveld, Ben}, title = {Hieracium maculatum subsp. pseudogougetianum, eine neue Unterart aus dem Mainfr{\"a}nkischen Muschelkalkgebiet}, series = {Forum Geobotanicum}, volume = {11}, journal = {Forum Geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2023.0923}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-327601}, pages = {15-20}, year = {2023}, abstract = {In Lower Franconia/Northern Bavaria, a well-defined subspecies of the Hieracium maculatum group was detected. This subspecies is restricted to the slopes of the Main valley between W{\"u}rzburg and Hasloch with a hot spot (>90\% of total population) between the villages Th{\"u}ngersheim and Retzbach. Due to some similarities with H. glaucinum subsp. prasiophaeum (synonym: subsp. gougetianum) the subspecies is named H. maculatum subsp. pseudogougetianum. This subspecies grows preferentially on shell-bearing limestone gravels and begins flowering as early as mid-April. Head involucra are whitish hairy mixed with dark stalked glands. The basal leaf rosette consists of ovate to elliptic, toothed to serrate, dark spotted leaves, glabrous, glaucous above. Stems bear 1-3(4) stalked stem leaves and usually form long lateral flowering branches from the leaf axils. Like some other H. maculatum subspecies, H. maculatum subsp. pseudogougetianum is tetraploid with a mean genome weight (2C value) of 14.5 pg, distinguishing it from the H. glaucinum group, whose studied taxa are invariably triploid (mean 10.1 pg).}, subject = {Korbbl{\"u}tler}, language = {de} } @article{GottschlichDrenckhahn2005, author = {Gottschlich, G{\"u}nter and Drenckhahn, Detlev}, title = {Iconography of the Genus Hieracium in central Europe - Part 1: General Description and Morphotypes}, doi = {10.3264/FG.2005.0502}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-35363}, year = {2005}, abstract = {The genus Hieracium comprises more than one thousand sexual and apomictic species in Europe, with numerous intermediates and microspecies. Only a small fraction of the members of the genus Hieracium has been illustrated or photo-documented in the literature. Since many of these publications are difficult to obtain, only a few specialists are familiar with most of the species and subspecies described in the literature. In order to overcome this problem and encourage geobotanical research on the genus Hieracium, we decided to edit an iconography of central and southern European Hieracia in an electronical journal (Forum geobotanicum) with free international access through the internet. Part I of this endeavour contains descriptions and photographs of the morphological spectrum of the genus Hieracium. Here, we categorize the genus into 15 basic morphotypes. These types conform partly to the sections and subsections of the genus Hieracium, but are in some cases informal and may even include members of different sections. Classification of morphotypes is considered helpful to obtain a first rough picture of an unknown species that then can be traced to the species and subspecies level by using keys or, after completion of this iconography, simply by screening the relevant images. One particularly novel aspect of the present endeavour will be the regular inclusion of magnified images and scanning electron micrographs.}, subject = {Habichtskraut}, language = {en} } @article{Drenckhahn2016, author = {Drenckhahn, Detlev}, title = {Morphologie und Jahreszyklus von Ficaria calthifolia Rchb. - eine neu etablierte Sippe in Deutschland}, series = {Forum Geobotanicum}, volume = {7}, journal = {Forum Geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2016.0714}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-136225}, pages = {1-17}, year = {2016}, abstract = {Ficaria calthifolia (diploide Form, Typ1) wurde k{\"u}rzlich nord-westlich des geschlossenen s{\"u}dosteurop{\"a}ischen Verbreitungsgebiet auch in Deutschland gefunden, n{\"a}mlich in W{\"u}rzburg (2006) und an Elbedeichen in Brandenburg (2014) und Sachsen (2015). Ficaria calthifolia ist durch das Fehlen von verl{\"a}ngerten mehrgliedrigen St{\"a}ngeln und die Abwesenheit von Brutknollen in den Blattachseln gekennzeichnet. Die 1-2 (3) St{\"a}ngel von Ficaria calthifolia verbleiben {\"u}berwiegend im Boden (hypog{\"a}isch), k{\"o}nnen aber im Laufe der Anthese aus dem Boden hervorwachsen. Die gestielten Laubbl{\"a}tter setzen sich aus Grundbl{\"a}ttern und einer Rosette von bis zu 8 St{\"a}ngelbl{\"a}ttern pro St{\"a}ngel zusammen. Letztere entspringen aus dem terminalen St{\"a}ngelknoten (St{\"a}ngelblatt-rosette). In W{\"u}rzburg kommen zwei Populationen von Ficaria calthifolia vor, diploide Typ1-Pflanzen und triploide Typ2-Pflanzen. Letztere sind robuster, besitzen gr{\"o}ßere Bl{\"u}ten (bis 4 cm) und entwickeln nur vereinzelte reife N{\"u}sschen. Pflanzen mit h{\"o}herem Ploidiegrad (wahrscheinlich pentaploid, Typ3) wurden auch gefunden. Etwa 60\% der 3 bis 8 Bl{\"u}tenstiele von Typ1-Pflanzen besitzt kein St{\"a}ngelblatt, der Rest einen Knoten mit 1 bis 2 (3) Hochbl{\"a}ttern. Die Zahl der Kronbl{\"a}tter betr{\"a}gt 8 (vereinzelt 9), die durchschnittliche Zahl reifer, eif{\"o}rmiger N{\"u}sschen pro Fruchtstand betr{\"a}gt 7 (W{\"u}rzburg) / 14 (Elbe) (maximal 26). Aus vom Rhizom abgebrochenen und im Mai gepflanzten Speicherknollen keimten im Sp{\"a}therbst desselben Jahrs neue Pflanzen. Der Jahreszyklus des Wurzelsystems wird beschrieben. Durch spontane Abl{\"o}sungen einzelner Speicherknollen findet eine vegetative Vermehrung statt. Neben N{\"u}sschen w{\"a}ren abgebrochene Speicherknollen f{\"u}r die Fernansiedlung der Sippe an Elbe (u.a. Verschleppung durch Hochwasser) und Main (Verschleppung durch Schiffe und andere Vektoren) ausreichend.}, subject = {Karyotyp}, language = {de} } @article{DrenckhahnGottschlichZonneveld2023, author = {Drenckhahn, Detlev and Gottschlich, G{\"u}nter and Zonneveld, Ben}, title = {Neubeschreibungen und 2C-Werte von Pilosella macranthela subsp. silvae-pici (Spessart-Mausohrhabichtskraut) und Pilosella ottonis (Otto-Mausohrhabichtskraut) mit einer {\"U}bersicht {\"u}ber das Vorkommen von P. macranthela-Taxa in Bayern.}, series = {Forum Geobotanicum}, volume = {11}, journal = {Forum Geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2023.1114}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-344797}, pages = {21-34}, year = {2023}, abstract = {A pentaploid taxon from the Pilosella macranthela group was discovered in Lower Franconia/Bavaria which is newly described here as P. macranthela subsp. sylvae-pici. It grows mainly in the Bavarian Bunter Spessart and occurs with three small, isolated stands also in the limestone area of the Main valley and Tauber area. Its habit of growth is intermediate between the furcata and laxicephala types of Pilosellae with epigeal and partly hypogeal stolons and a tendency to form clusters. The upper and lower surfaces of the rosette leaves have stellate hairs. The peduncles and the phyllaries are densely covered with dark glandular hairs with yellowish glandular heads. The lateral teeth of the ligules often are separated by incisions. A tetra- und pentaploid transitional taxon between P. macranthela subsp. sylvae-pici and P. officinarum is described as P. ottonis. P. ottonis is tetra- and pentaploid with up to 7 capitula. It is densely covered with dark stalk glands on phyllaries and resembles forms of P. acutifolia in habit. The phyllaries of P. ottonis are covered with numerous epidermal papillae with a diameter of about 10-20 μm and in this aspect resemble P. macranthela subsp. sylvae-pici and P. glomerata. However, in P. officinarum epidermal papillae are absent. Plants of genetically heterogeneous tetra- and heptaploid P. macranthela have been found outside the Spessart as spontaneous hybrids between P. glomerata and P. officinarum and also occur sporadically without P. glomerata in the vicinity.}, subject = {Habichtskraut}, language = {de} } @article{Drenckhahn2004, author = {Drenckhahn, Detlev}, title = {Neue und wieder entdeckte Hieracien auf R{\"u}gen}, doi = {10.3264/FG.2004.0127}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-34843}, year = {2004}, abstract = {The island of R{\"u}gen (Rugia), located in the Baltic sea, is the most northeastern (NE) part of Germany. Due to its particular geographic position at the border between scandinavian, middle european and continental european floral elements, R{\"u}gen harbours several hawkweed species (Hieracia) of the scandinavian area such as Hieracium fuscocinererum, H. subramosum, H. subrigidum and H. diaphanoides subsp. neoornatum and, at the same time, is the most northwestern location of H. echioides. Two endemic Hieracium species have been identified recently, i. e. H. muorum subsp. rugianum and H. caesium subsp. zabelianum (Gottschlich et al. 1998, Bot. Rundbr. Mecklenburg-Vorpommern 31:1-94). In the present communication, two further novel endemic Hieracium taxa will be described, which are restricted to the chalk cliffs of Cape Arkona and Jasmund, i. e. H. swantevitii and H. lachenalii subsp. litocretaceum. H. swantevitii (Swantevit's hawkweed) is intermediate between H. caesium/H. bifidum and H. lachenalii with hairy, modestly glandular involucre and slightly serrated elongated leaves . This view of an intermediate position of H. swantevitii between these species was further supported by the ultrastructure of epidermal papillae of the outer bracts of the involucre visualized by scanning electron microscopy. H. lachenalii subsp. litocretaceum (chalk cliff hawkweed) is characterized by its narrow anguste to almost linear denticulate leaves in combination with mode rately glandular heads. In addition to the description of these two new hawkweed taxa , the rediscovery of three further species will be reported for R{\"u}gen, i. e. H. echioides (W. Gager in SE R{\"u}gen), H. cymosum subsp. cymosum (close to G{\"o}hren in SE R{\"u}gen) and H. subrigidum E Glowe in N R{\"u}gen. The locality of H. echioides appears to be most north-western site in middle Europe, the locality of H. cymosum is one of the last growth sites in the northern German lowlands and H. subrigidum (so far only known as a single herbarium specimen, collected 1858 in R{\"u}gen) has so far not been recorded in other localities of middle Europe.}, subject = {Habichtskraut}, language = {de} } @article{DrenckhahnZonneveld2022, author = {Drenckhahn, Detlev and Zonneveld, Ben}, title = {Rubus admirabilis Drenckhahn, eine neue Brombeerart aus dem Formenkreis der Serie Vestiti an der Westk{\"u}ste von Schleswig-Holstein, Deutschland}, series = {Forum Geobotanicum}, volume = {10}, journal = {Forum Geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2022.1228}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-298658}, pages = {38-44}, year = {2022}, abstract = {Rubus admirabilis Drenckhahn is a tetraploid new species of the Rubus section Rubus, series Vestiti. Stem leaves are 5-foliolate, digitate to weakly pedate with elongated, obovate acuminate terminal leaflets, adpressed hairy upper side and light green shimmering, softly hairy under side. Stems are arching (up to 2 m) partly climbing, obtuse-angled, densely hairy and glandular, gray green to dull brown, armed with 10(3-21) /5cm straight slender prickles, mostly 30-45º declining, 4.6(3-7)mm long. Pedicles of inflorescence are densely hairy (patent and partly adpressed), armed with 2-4 (per cm) slender patent to slightly curved prickles (1-2 mm long) and studded with numerous stalked glands (0.3-0.5 mm long) and some bristles. The species tolerates shadow and prefers moist soil. The type locality is probably the species' site of introduction or genesis. It is located west of the town Garding on the North Frisian peninsula of Eiderstedt (several hundred shrubs), where several non-native Rubus species were probably introduced in the course of reforestation in 1970. Rubus admirabilis spreads south to the town of Heide in Dithmarschen and north to the island of Amrum (maximal range diameter of 70 km) and seems to be in an expansive phase.}, subject = {Brombeere}, language = {de} } @article{DrenckhahnJansenWeber2018, author = {Drenckhahn, Detlev and Jansen, Werner and Weber, Heinrich E.}, title = {Rubus pseudoglotta Drenckhahn \& W. Jansen, eine neue deutsch-d{\"a}nische Brombeerart aus dem Formenkreis des Rubus phylloglotta (Frid.) {\AA}. Gust.}, series = {Forum Geobotanicum}, volume = {8}, journal = {Forum Geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2018.1228}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-174599}, pages = {15-23}, year = {2018}, abstract = {Rubus pseudoglotta Drenckhahn \& W. Jansen ist eine tetraploide Brombeerart aus der Sektion Corylifolii (Serie Subradula), die bisher zum Variabilit{\"a}ts-Spektrum von R. phylloglotta (Frid.) {\AA}. Gust. gez{\"a}hlt wurde. Charakteristische Merkmale sind die 4 (3-5)-z{\"a}hligen Bl{\"a}tter mit obovaten Endbl{\"a}ttchen mit kurzer (ca. 1 cm) abgesetzter Spitze, kurzhaariger Blattoberseite und f{\"u}hlbar behaarter gr{\"u}ner Blattunterseite. Die flach bogigen, teils klimmenden Sch{\"o}sslinge sind {\"u}berwiegend stumpfkantig, gr{\"u}n bis r{\"o}tlichbraun, schwach behaart und reichlich mit 2-4 (5) mm langen, geraden bis schwach gekr{\"u}mmten Stacheln und kleineren Stacheln, Stachelh{\"o}ckern, Stieldr{\"u}sen und Borsten besetzt. Die Bl{\"u}tenstiele sind mit 2-8 (pro cm) schlanken, geraden bis leicht gekr{\"u}mmten Stacheln (1-2 mm lang) und zahlreichen Stieldr{\"u}sen (teils bis 0,6 mm lang) besetzt. Die Sippe w{\"a}chst bevorzugt an Straßen- und Wegr{\"a}ndern und in Hecken. Die bekannt gewordenen Fundstellen erstrecken sich von Rendsburg bis in das Umfeld von Kiel, nordw{\"a}rts bis zu den d{\"a}nischen Inseln Alsen und F{\"u}nen. Unsere Untersuchungen zeigen weiterhin, dass R. phylloglotta bisher nicht in Schleswig-Holstein/Deutschland nachgewiesen wurde. Ob R. phylloglotta {\"u}berhaupt außerhalb der Insel T{\aa}singe in D{\"a}nemark vorkommt, bedarf weiterer Nachforschungen.}, subject = {Rubus}, language = {de} } @article{DrenckhahnZonneveld2017, author = {Drenckhahn, Detlev and Zonneveld, Ben}, title = {Rubus viridilucidus Drenckhahn, eine neue Brombeerart aus der Sektion Corylifolii, Serie Subcanescentes}, series = {Forum Geobotanicum}, volume = {7}, journal = {Forum Geobotanicum}, issn = {1867-9315}, doi = {10.3264/FG.2017.1221}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-156257}, pages = {34-42}, year = {2017}, abstract = {Rubus viridilucidus Drenckhahn ist eine tetraploide Brombeerart (2n=28) aus der Sektion Corylifolii, Serie Subcanescentes mit einem Genomgewicht (2C-Wert) von 1,49 pg, das dem Genomgewicht verwandter Sippen der Serie Subcanescentes wie R. scabrosus, R. fasciculatiformis und R. fasciculatus (1,52-1,54 pg) aus Unterfranken entspricht. Charakteristische Merkmale sind 3-4(5)-z{\"a}hlige Bl{\"a}tter mit herab gekr{\"u}mmten rundlichen bis breit obovaten Endbl{\"a}ttchen und breitovalen Seitenbl{\"a}ttchen, die eine v{\"o}llig unbehaarte, lichtgr{\"u}ne, mattgl{\"a}nzende Blattoberfl{\"a}che besitzen mit kontrastierender hell gr{\"u}nlich-grauer, samtig behaarter Blattunterseite. Die {\"u}berwiegend rundlichen bis stumpf kantigen, lichtgr{\"u}nen bis r{\"o}tlich {\"u}berlaufenen Sch{\"o}sslinge sind unbehaart und sp{\"a}rlich mit kurzen (<4mm) nadelf{\"o}rmigen Stacheln und wenigen Stieldr{\"u}sen besetzt. R. viridilucidus entwickelt zus{\"a}tzlich zu den Bl{\"u}tenzweigen der zweij{\"a}hrigen Sch{\"o}sslinge (Ausbreitungssch{\"o}sslinge) einen besonderen bl{\"u}henden 0,8 bis 1,6 m langen Sch{\"o}sslingstyp aus, den Rispensch{\"o}ssling, der direkt aus dem Wurzelstock entspringt und terminal in eine Bl{\"u}tenrispe ausl{\"a}uft. Bei R. viridilucidus sind zwei verschiedene Typen von Rispensch{\"o}sslingen ausgebildet. Die Sippe w{\"a}chst bevorzugt auf gest{\"o}rten Fl{\"a}chen wie Brachen, Straßenr{\"a}ndern, Lagerpl{\"a}tzen, Weinbergr{\"a}ndern und kann sich mit 1-2 m j{\"a}hrlichem Zuwachs (Satellitenbildauswertung, Vermessungen vor Ort) schnell ausbreiten. Die bekannt gewordenen Fundstellen erstrecken sich vom n{\"o}rdlichen Baden-W{\"u}rttemberg bis in den n{\"o}rdlichsten Teil von Bayern (Rh{\"o}n).}, subject = {Brombeere}, language = {de} }