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New Fertile Species of Psilophyton from the Devonian of Maine

Andrew E. Kasper, Henry N. Andrews and William H. Forbes
American Journal of Botany
Vol. 61, No. 4 (Apr., 1974), pp. 339-359
Stable URL: http://www.jstor.org/stable/2441802
Page Count: 21
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New Fertile Species of Psilophyton from the Devonian of Maine
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Abstract

A review of the history of the genus Psilophyton is presented. Two new species with sporangia in organic connection, P. microspinosum and P. dapsile, are described. They are compared with Psilophyton-like plants from Maine and other previously described fertile species of this genus. Evidence from several species in the Trout Valley flora confirms the concept of this taxon as presented by Hueber and Banks. Data based on all sporangium-bearing species of Psilophyton are outlined, certain evolutionary trends within the taxon are tentatively presented, and recommendations for the treatment of the numerous fragmentary species and future new species are suggested.

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