Evidence for a Pollination-Drop Mechanism in Paleozoic Pteridosperms

Science  23 Dec 1977:
Vol. 198, Issue 4323, pp. 1251-1252
DOI: 10.1126/science.198.4323.1251


A noncellular substance containing pollen and spores has been discovered protruding from the micropyle of a seed fern ovule of Middle Pennsylvanian age. This provides direct evidence that pollination-drop mechanisms comparable to those of many extant gymnosperms characterize some Paleozoic pteridosperms.