The pollen that they produce is strictly known as pre-pollen, as it germinated proximally and was thus intermediate in structure between pteridophytic spores and gymnospermous true-pollen.
2.
In contrast, another of his scientific ideas has been disproven by later modern research the idea of a direct ancestry of the " centrosperms " ( approximately equal to Caryophyllales ) from the gymnospermous Gnetophyta and, hence, two separate evolutionary lineages within the flowering plants.
परिभाषा
relating to or characteristic of plants of the class Gymnospermae
मोबाइल