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Didymoglossum kraussii (Hook. & Grev.) Presl   (redirected from: Trichomanes krausii Hook. & Grev.)
Family: Hymenophyllaceae
[Didymoglossum fructuosum Fée, moreHemiphlebium kraussii (Hook. & Grev.) Prantl, Trichomanes acropteron Fée, Trichomanes krausii Hook. & Grev.]
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Donald R. Farrar in Flora of North America (vol. 2)
Plants epiphytic or on rock. Stems long-creeping, threadlike, bearing scattered leaves; stems covered with dark hairs of 2 types: 2-celled glandular hairs and elongate rhizoidlike hairs; roots absent. Leaves oblong, 1--2-pinnatifid, 1--5 × 0.5--1.5 cm, with dark, stellate marginal hairs between lobes, 2-celled glandular hairs on petioles and veins, and dark rhizoidlike hairs on petioles and sometimes abaxially on blades; petioles shorter than blades. Venation pinnate with unconnected false veins. Soral involucres terminal on lobes near leaf apices, conic, flaring at mouth; involucre lips narrowly dark edged. Gametophytes composed entirely of branching filaments. Gemmae composed of short filaments of undifferentiated cells. 2 n = 136. On rock walls of limestone sinks or epiphytic on trunks and roots of trees growing in and around limestone sinks; below 10 m; Fla.; Mexico; West Indies; Central America; South America. Trichomanes krausii is fairly common in and around limestone sinks in hardwood forests in Dade County, Florida. Gametophytes may be found occasionally in the vicinity of sporophytes, but they do not form large independent colonies.

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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.