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Science 23 December 1977:
Vol. 198. no. 4323, pp. 1260 - 1262
DOI: 10.1126/science.198.4323.1260
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Articles

Chemical Evidence for Separating the Psilotaceae from the Filicales

GILLIAN COOPER-DRIVER 1

1 Biological Science Center, Boston University, Boston, Massachusetts 02215

The distribution of flavonoid compounds in Psilotum, Tmesipteris, and primitive filicalean ferns shows that it is unlikely the two groups are closely related. The Psilotaceae synthesize only amentoflavone and related biflavonyls which are totally absent from ferns. The primitive ferns contain the full complement of flavonols and proanthocyanidins, as found in all other filicalean families.

Submitted on August 3, 1977
Revised on September 12, 1977

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Science. ISSN 0036-8075 (print), 1095-9203 (online)