Pellaea cordifolia (Sessé & Moc.) A.R.Sm.
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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 short, stout, compact; rhizome scales 5–6 x 0.3–0.8 mm, dull tan to reddish brown, linear-lanceolate, irregularly denticulate, tortuous; fronds to 30 cm long, erect; stipes 1/4–1/2 the frond length, nearly terete to plane adaxially, stramineous and glistening, glabrous or rarely sparsely pubescent; rachises and segment stalks essentially glabrous, with occasional short hairs on pinnule stalks; blades narrowly oblong to deltate, 2-pinnate, light green, yellow-green to gray-green; pinnae widely spreading to slightly ascending, segments round, ca. 12 x 9–11 mm, bases cordate, terminal pinnule on each pinnae with equilateral base, pinnae at broader angle to rachises than in P. sagittata, with only a few hairs abaxially on veins and costae near terminal segments; modified indusia 0.1–0.3 mm wide, entire, occasional hairs along recurved margin, cells along recurved margins whitened; spores brown; 2n=58 (DF).
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Discussion
Adiantum cordifolium Sesse´ & Moc¸., Naturaleza (Mexico City), ser. 2, 1(Append.): 182. 1890. Type. Mexico. [Distrito Federal:] Cuyuaca´n [Coyoaca´n] and San Agusti´n near Mexico City (MA). Pteris cordata Cav., Descr. Pl. 267. 1801. Pellaea cordata (Cav.) J. Sm., Cult. Ferns 4. 1857, hom. illeg., non Fe´e, 1852. Pellaea cardiomorpha Weath., J. Arnold Arbor. 24: 309. 1943. Pellaea sagittata (Cav.) Link var. cordata (Cav.) A. F. Tryon, Ann. Missouri Bot. Gard. 44: 166. 1957. Type. Mexico. [Morelos?:] Chapultepec, Ne´e s.n. (MA; isotype F). For additional synonymy, see A. Tryon (1957).
Pellaea cordifolia is distinct from P. sagittata in its roundcordate segments.
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Distribution
Dry, rocky slopes or basaltic cliffs in oak forests; 1900–3050 m. Sw USA (Tex); Mexico.
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