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- W2054312312 abstract "The petrified Paleozoic seed Hexapterospermum is discussed. A new species, H. delevoryii , is described from several seed specimens collected from Middle Pennsylvanian deposits in southern Illinois. The new species is radially symmetrical; approximately 2.5 cm long and 1.3 cm in diam at the widest region. Six primary ribs extend from the integument and give the seed the configuration of a hexagon when sectioned transversely. A thin plate of cells is present at the region of the commissure in each of the ribs. Additional features, not included in the original description of the genus, are described including the occurrence of a pollen‐receiving mechanism consisting of a collar‐like nucellar extension surrounding a central column. Relationships with other Paleozoic seeds are also discussed." @default.
- W2054312312 created "2016-06-24" @default.
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- W2054312312 date "1966-02-01" @default.
- W2054312312 modified "2023-10-16" @default.
- W2054312312 title "PALEOZOIC SEED STUDIES: ON THE GENUS HEXAPTEROSPERMUM" @default.
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- W2054312312 doi "https://doi.org/10.1002/j.1537-2197.1966.tb07320.x" @default.
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