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Updated: Jul 11, 2026
06:45
Live Imaging of Arabidopsis Pollen Tube Reception and Double Fertilization Using the Semi-In Vitro Cum Septum Method
Published on: February 24, 2023
Evidence of pollen tubes in paleozoic pteridosperms
Science (New York, N.Y.)
|February 18, 1972
Abstract:
A saccate pollen grain with a branched pollen tube has been discovered within the pollen chamber of a fossil seed-fern ovule of Middle Pennsylvanian age. This suggests that microgametophytes comparable to those of living gymnosperms were produced by some Paleozoic pteridosperms.
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