American fossil cycads (1906) (18120863656)

Title: American fossil cycads

Identifier: americanfossilc01wiel (find matches)

Year: 1906 (1900s)

Authors: Wieland, G. R. (George Reber), 1865-1953

Subjects: Cycadaceae

Publisher: Washington : Carnegie Institution

Contributing Library: Robarts - University of Toronto

Digitizing Sponsor: University of Toronto

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Fig. 101.—Dion edule.—Low-growing columnar and heavily armored type of cycadean trunk with markedly villose leaf bases and scale leaves and several adventitious basal fronds. Staminate plant bearing a single terminal cone 9 cm. in diameter. The great reduction of the sporophylls leaves it physiologically impossible for the conical axis to serve as an integral extension of the stem after the iraturity of spores as in ovulate forms of Cycas, limited growth of the axes of fructification being correlated with sporophyll reduction,

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1906

University of Toronto

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