Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Polypodiaceae
Species Description - Rhizomes short-creeping, 3–7 mm diam.; rhizome scales reddish brown, dark towards margins, lanceolate, acuminate, margins toothed, papillose; fronds 8–60 cm long, clumped; stipes black, 1/8–1/3 the frond length, glabrous; blades narrow to linear elliptic, 3–11 cm wide, reduced to lobes at bases, the reduced lobes spreading, not deflexed; rachises abaxially with orangish to red-brown, ovate to lanceolate, sometimes bullate scales, margins toothed, papillate or fimbriate, also with a few septate hairs to 0.5 mm; pinnae linear-obtuse, 1.5–3(–6) cm x 1.5–3.5 mm, surcurrent and decurrent, costae black, decurrent onto rachises; veins free, mostly 1-forked; indument adaxially of sparse hairs 0.1– 0.3 mm on costae, laminar surfaces glabrous or nearly so, abaxially the costae with sparse septate hairs 0.3–0.5 mm and scattered bullate scales 0.5 mm long, laminar surfaces between veins with scattered appressed hairs, margins with a few hairs 0.2–0.5 mm; sori round, medial, with clavate paraphyses to 0.5 mm; sporangia with hairs 0.1 mm on capsules; spores reniform, 64 per sporangium; 2n =148 (Fla, Jam).
Polypodium plumula Humb. & Bonpl. ex Willd., Sp. Pl., ed. 4, 5(1): 178. 1810. Ctenopteris plumula (Humb. & Bonpl. ex Willd.) J. Sm., Hist. Fil. 185. 1875. Lectotype (chosen by Evans, 1968: 230). Venezuela. Caracas, Bredemeyer s.n. (B-Willd. 19655-1!, photo BM, frag. NY!; isotype P-Humb.!). Polypodium pulchrum M. Martens & Galeotti, Me´m. Foug. Mexique 41, pl. 8, f. 2. 1842. Type. Mexico. Veracruz: Jalapa, Galeotti 6332 (BR!-photos UC!, US!; isotypes BR!-2 sheets, K-photo US!; frag. NY!).Polypodium pulchrum M. Martens & Galeotti var. minus E. Fourn., Mexic. Pl. 1: 76. 1872, nom. nud.
Unverified, Doubtful, or Mistaken Reports. Gro (Urbina 46, FCME, cited by Lorea-Herna´ndez & Vela´zquez M., 1998, but not verified). Gto (Rzedowski 40576, IEB, cited by Di´az-Barriga & Palacios- Rios, 1992, but not verified). Mich (Arse`ne 6696, MEXU, and Rzedowski 40576, 42127, IEB, cited by Di´az-Barriga & Palacios-Rios, 1992, but not verified). Sin (reported by Mickel & Beitel, 1988, probably on the basis of Dunn et al. 21813, ENCB, NY, but the specimen is P. alfredii, probably var. occidentalis).
Pecluma plumula is distinct from congeners in Mexico by the combination of black stipes, lanceolate, toothed rhizome scales, proximal pinnae a little shortened but not deflexed, persistent lanceolate rachis scales, and setulose sporangia. Herna´ndez G. 755 (MEXU), cited by Mickel and Beitel (1988) as this species, is P. dispersa.
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