.i.Porostrobus nathorstii./i. (Leary & Mickle) emend. and its spores from the Namurian of Illinois, USA

0376305 - GLÚ 2013 RIV CZ eng J - Článek v odborném periodiku
Bek, Jiří - Leary, R. L.
Porostrobus nathorstii (Leary & Mickle) emend. and its spores from the Namurian of Illinois, USA.
Bulletin of Geosciences. Roč. 87, č. 1 (2012), s. 45-52. ISSN 1214-1119. E-ISSN 1802-8225
Grant CEP: GA AV ČR IAA301110701
Výzkumný záměr: CEZ:AV0Z30130516
Klíčová slova: herbaceous lycopsids * in situ spores * Porostrobus * Bothrodendrostrobus * Carboniferous
Kód oboru RIV: DB - Geologie a mineralogie
Impakt faktor: 1.141, rok: 2012

The type collection of the Carboniferous selaginellalean lycopsid cone species Porostrobus nathorstii (Leary & Mickle) emend. was palynologically re-examined for in situ microspores. Originally (Leary & Mickle 1989) this species was proposed as monosporangiate with only megaspores, but now microsporangia yielded microspores compared to the dispersed miospore genus Cingulizonates (Dybova & Jachowicz) Butterworth et al. All species of the genus Porostrobus Nathorst are, therefore, bisporangiate with in situ megaspores of the Setosisporites-type and microspores belong to the densospore group [genera Densosporites (Berry) Butterworth et al. and Cingulizonates]. The history of Porostrobus and Bothrodendrostrobus Hirmer cones is discussed with aspect of their possible relationship and ecological needs.
Trvalý link: http://hdl.handle.net/11104/0208743