| 词条 | Stamnostoma |
| 释义 |
| fossil_range = {{Geological range/linked|Early Carboniferous}} | image = Stamnostoma huttonense reconstruction.jpg | image_caption = A reconstruction of Stamnostoma huttonense from the Early Carboniferous Cementstone Group at Foulden Newton, Berwickshire, England[1] | taxon = Stamnostoma | authority = Long 1960 | subdivision_ranks = Species | subdivision = Stamnostoma huttonense }} Stamnostoma is an extinct genus of seed ferns based on cupules with seeds. These are among the earliest known seed plants and of earliest Carboniferous (Tournaisian) age. DescriptionThe ovules of Stamnostoma have a complex apex with plug and cone mechanism for creating a chamber for prepollen, as in other Lyginopteridales. Several ovules are borne on an elongate open cupule of bracts. Whole plant reconstructionsDifferent organs attributed to the same original plant can be reconstructed from co-occurrence at the same localities in the Scottish Borders county of Berwickshire.
References1. ^{{cite journal | title=Reconstructions of selected seed ferns. |author1=Retallack, G.J. |author2=Dilcher, D.L |lastauthoramp=yes | journal=Annals of the Missouri Botanical Garden | year=1988 | volume=75 | pages=1010–1057 | doi=10.2307/2399379}} {{Taxonbar|from=Q25095541}}{{paleobotany-stub}} 5 : Pteridospermatophyta|Mississippian plants|Prehistoric plant genera|Mississippian first appearances|Mississippian extinctions |
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