Publication Date:
2021-03-29
Description:
The arborescent lycophyte group known as the sigillarians
bore pedunculate fructifications, including Sigillariostrobus
Schimper, which has a known propensity to disaggregate,
making comparisons of cones and in situ spores often
difficult if not impossible. Sigillariostrobus is monosporangiate,
containing either megaspores or microspores. Two
new species of Sigillariostrobus with megaspores are described
from the British Coal Measures. Two cones of
Sigillariostrobus saltwellensis sp. nov. are described from
Langsettian–Duckmantian strata of Great Britain, containing
in situ Laevigatisporites glabratus (Zerndt) Potonié and
Kremp spores, making this the first British Sigillariostrobus
species described containing such spores. Sigillariostrobus
barkeri sp. nov. is given here to the previously described
cone with in situ Tuberculatisporites brevispiculus (Schopf)
Potonié and Kremp spores. This is the first Sigillariostrobus
cone with this megaspore species in situ, and thus shows
that T. brevispiculus and T. mamillarius (Bartlett) Potonié
and Kremp are not conspecific as others have previously suggested.
Description:
Open-Access Publikationsfonds 2015
Keywords:
Sigillariostrobus Schimper; megasporangiate; British Coal Measures
;
551
Language:
English
Type:
article
,
publishedVersion
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