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Pellaea truncata Goodd.  
Family: Pteridaceae
[Hemionitis truncata (Goodd.) Christenh.]
Pellaea truncata image
Max Licher
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Michael D. Windham in Flora of North America (vol. 2)
Stems compact, ascending, stout, 5--10 mm diam.; scales bicolored, linear-subulate, 0.1--0.3 mm wide, centers black, thick, margins brown, thin, erose-dentate. Leaves somewhat dimorphic, sterile leaves shorter and less divided than fertile leaves, clustered on stems, 8--40 cm; croziers sparsely villous. Petiole dark brown, lustrous, flattened or slightly grooved adaxially, without prominent articulation lines. Blade ovate-deltate, usually 2-pinnate proximally, 4--18 cm wide; rachis brown throughout, straight, shallowly grooved adaxially, usually glabrous. Pinnae perpendicular to rachis to slightly ascending, not decurrent on rachis, usually with 9--25 ultimate segments; costae straight, 20--70 mm, much longer than fertile ultimate segments. Ultimate segments narrowly oblong, 4--10 mm, leathery, glabrous; margins recurved on fertile segments, usually covering less than 1/2 abaxial surface, borders whitish, nearly entire; apex mucronate. Veins of ultimate segments obscure. Sporangia long-stalked, containing 64 spores, intermixed with abundant farina-producing glands. 2 n = 58. Sporulating late spring--fall. Cliffs and rocky slopes, on various substrates but rarely observed on limestone; 600--2500 m; Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah; n Mexico. Most manuals refer to Pellaea truncata as P . longimucronata , a name shown to be invalid by A. Cronquist et al. (1972+, vol. 1). Populations located near the range of P . mucronata in the Mojave Desert are often difficult to identify because of the subtlety of the characters involved and an apparent tendency to produce sterile (and possibly fertile) hybrids. Morphologically intermediate hybrids between P . truncata and P . wrightiana are common in regions where the ranges of the two species overlap, but these are easily identified by their malformed spores.

Pellaea truncata
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Pellaea truncata image
Max Licher
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Max Licher
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Max Licher
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Max Licher
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Leslie Landrum
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Liz Makings
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Leslie Landrum
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Patrick Alexander
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Mingna Zhuang
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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.