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Systematic Implications of Flavonoid Pigments in the Fern Genus Hemionitis (Adiantiaceae)
David E. Giannasi and John T. Mickel
Vol. 31, No. 3 (Jul. - Sep., 1979), pp. 405-412
Stable URL: http://www.jstor.org/stable/2806135
Page Count: 8
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The closely related fern genera Hemionitis L. and Gymnopteris Bernhardi are separated primarily on differences in leaf architecture and venation. Studies indicate that these characters are highly variable and unreliably diagnostic. Further, the type species of the two genera readily hybridize with each other. Spore morphology, as exhibited by SEM, does not support the traditional alignment of the species in these two genera: some species of hemionitis and Gymnopteris have the same rugose to papillate spores, while other species from both genera possess crested spores. The flavonoid chemistry of these taxa coinciedes with spore type, i.e., taxa from both genera which possess crested spores produce kaempferol and quercetin 3-0-glycosides, while species with tuberculate spores produce only quercetin 3,4 -0-glycosides. The spore and chemical data suggest a realignment of these taxa within a single genus, which would avoid the rather tenuous dependence on a single vegetative character for generic distinctions.
Brittonia © 1979 New York Botanical Garden Press