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Taxonomy and Distribution of Isoetes valida
Daniel F. Brunton and Donald M. Britton
American Fern Journal
Vol. 86, No. 1 (Jan. - Mar., 1996), pp. 16-25
Published by: American Fern Society
Stable URL: http://www.jstor.org/stable/1547604
Page Count: 10
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Isoetes valida constitutes an earlier valid name for I. caroliniana. This emergent aquatic, diploid quillwort is known from nine states along the Appalachian Mountains and Piedmont, growing in cold streams, mountain woodland ponds and in the saturated organic ooze of springs from central Pennsylvania to northeastern Alabama. It exhibits a distribution similar to several other endemic Appalachian pteridophytes. Disjunct populations are also known from the Coastal Plain of southeastern Alabama and Delaware. Although similar in appearance to I. engelmannii, I. valida is typically distinguished by its raggedly reticulate megaspore ornamentation, its velum covering 50% or more of the unmarked sporangium wall, and spinulose microspores.
American Fern Journal © 1996 American Fern Society