Article

Speirseopteris orbiculata gen. et sp. nov. (Thelypteridaceae), a Derived Fossil Filicalean from the Paleocene of Western North America.

2006-05-01

Abstract excerpt

An apparently exindusiate filicalean fern with radial sori, sporangia with a vertical annulus, and monolete spores occurs in Paleocene sediments ca. 57 million years old of central Alberta, Canada. Specimens are preserved as coalified compressions and show features of frond morphology and venation, sporangium morphology and dehiscence mechanism, number of spores per sporangium, and spore fine structure. Fronds hav...

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Identifiers and source

Literature Corpus work: 6639fbbf-5dd2-578d-a50d-1c65ea9c8867
DOI: 10.1086/501233

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