fossil occurrence host:waynesword.palomar.edu

Listing 1 - 2 from 2 for fossil occurrence

Azolla and Anaebaena Symbiosis
... cling to the female megaspores, thus facilitating fertilization. According to some references, the universal occurrence of Anabaena azollae inside the leaves of Azolla suggests that reproduction of this ... Although filamentous cyanobacteria (with cells resembling heterocysts) date back more than two billion years, fossil Azolla plants are known only from late Cretaceous deposits less than 80 million ...
waynesword.palomar.edu

Continental Drift & Plant Distribution
... scales bear large, bright red seeds which sink in water. Cycads date back in the fossil record to a time when dinosaurs roamed the land and when the earth's continents ... exist during the time frame of Pangea. Several theories have been proposed to explain the occurrence of two remarkably similar species of copal-bearing trees of the genus Hymenaea on the ...
waynesword.palomar.edu