%0 Journal Article
%T Porostrobus nathorstii (Leary & Mickle) emend. and its spores from the Namurian of Illinois, USA
%A Bek J
%A Leary R L
%J Bulletin of Geosciences
%D 2012
%I Czech Geological Survey
%R 10.3140/bull.geosci.1293
%X 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.
%K herbaceous lycopsids
%K <i>in situ </i>spores
%K <i>Porostrobus</i>
%K <i>Bothrodendrostrobus</i>
%K Carboniferous
%U http://www.geology.cz/bulletin/fulltext/1293_Bek.pdf