Tuesday, May 11, 2010

Ferns Are Unfurling

Ferns are in the later stages of unfurling on the land.  Their fronds first emerge as fiddleheads which then unroll to become full-sized fronds.  These prehistoric vascular plants, which reproduce by spores,  developed great diversity in the Cretaceous period (146 to 65 million years ago).  That was a time when dinosaurs roamed the land and ferns grew to the size of trees.

Posted by michael

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