On 26 Nov 1996, Tianna Alain Kennedy wrote:
> Hello,
> Through the course of a class discussion on the subject of ferns
> and fern allies, a fellow student posed an interesting question that no
> one was able to answer. I was wondering if, perhaps, one one you might be
> able to?
>> The question is whether there were sphenophyta that were not
> equisetum that may be extinct now, or whether sphenophyta have always been
> equisetum?
>> Any takers?
My old second edition of Foster and Gifford's Comparative Morphorlogy of
Vascular Plants gives Four Orders and Families with about eleven extinct
genera within a class Sphenopsida equivalent to Sphenophyta at the
division or phylum level.>
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Patrick Elvander Department of Biology
Lecturer in Biology Sinsheimer Labs
408-459-3674 University of California
1156 High St.
elvander at biology.ucsc.edu Santa Cruz, CA 95064
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