Cheilanthes yavapensis T.Reeves ex Windham
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Authority
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
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Family
Pteridaceae
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Scientific Name
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Description
Species Description - Rhizomes long-creeping, horizontal, 1–1.5 mm diam.; rhizome scales ovate-lanceolate, subconcolorous blackish, lustrous, 2–3 mm long, entire; fronds to 22 cm long, distant; stipes 1/3–1/2 the frond length, castaneous, terete, lustrous, with abundant linear whitish scales and hairs; blades narrowly lanceolate, 4-pinnate; pinnae 12–15 pairs, equilateral; segments bead-like, 0.5–1 mm long; adaxial surfaces glabrous; abaxial surfaces with ovatelanceolate, mostly castaneous scales, margins ciliate the entire length; laminar margins recurved, weakly differentiated; sporangia 32-spored; spores tan; n = 2n =120, apogamous (USA).
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Discussion
Type. U.S.A. Arizona: Yavapai Co., small east-wall tributary of Black Canyon at a point 3.09 km SSW of Sheep Gulch Spring and 1.13 km NE of the confluence of Black Canyon and Sycamore Creek, Windham 202 (UT; isotypes ASC!, ASU!, US!).
Cheilanthes yavapensis is thought to be the hybrid between C. covillei and C. lindheimeri (Gastony &Windham, 1989), but has most often been treated as part of C. wootonii. It is distinct from the latter species in having: rhizome scales dark brown to bicolorous, tightly appressed, and persistent (vs. brown, loosely appressed, and somewhat deciduous); adaxial blade surfaces sparsely pubescent (vs. glabrous); abaxial blade scales ciliate most of their length (vs. ciliate only in the basal half); n=2n=120, apogamous tetraploid (vs. n=2n=90, apogamous triploid).
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Distribution
Rock crevices, north-facing slopes; 1520–1650 m. USA (Ariz, N Mex, Tex); Mexico.
Mexico North America|