Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Pteridaceae
Species Description - Rhizomes short- to long-creeping, horizontal, 1–2 mm diam.; rhizome scales linear, concolorous orange-brown to weakly bicolorous with age; fronds to 30 cm long, approximate to 5 mm distant; stipes ca. 1/3 the frond length, castaneous to black, lustrous, terete, glabrate with scattered, fine, 1–3 mm golden hairs; distal stipes and rachises puberulent adaxially with 0.2–0.5 mm long hairs, hirsute abaxially with appressed, 1–3 mm long hairs; blades lanceolate, 2–3-pinnate, chartaceous; adaxial surfaces glabrous or with scattered 0.1 mm white hairs; abaxial surfaces with scattered to dense 0.1–0.2 mm white hairs along veins or rarely glabrous; laminar margins curved, modified into 0.3 mm wide false indusia, margins entire or with very short hairs; spores tan; n=2n =87 (SLP), 2n =116 (Jam, USA).
Adiantum microphyllum Sw., Prodr. 135. 1788. Type. Jamaica. Swartz s.n. (S!; isotype BM!). Cheilanthes pubescens Kunth, Nov. Gen. Sp. 1: 21. 1815. Type. Mexico. Veracruz: prope Xalapa, Humboldt & Bonpland s.n. (B-Willd. 20121).
Unverified, Doubtful, or Mistaken Reports. Gto (Rzedowski 39261, IEB, cited by Di´az-Barriga & Palacios-Rios, 1992, but not verified).
Cheilanthes microphylla is most often confused with C. alabamensis, which can be distinguished by being more coriaceous, more nearly bipinnate, and the segments acute to acuminate. Cheilanthes aemula is in the same complex but has broadly deltate blades. Cheilanthes fimbriata has been included within C. microphylla but is distinct in its fimbriate indusial margins and distribution on the Atlantic slope. Cheilanthes notholaenoides and C. cucullans are closely allied, but are distinct from C. microphylla in having long, evenly distributed rachis hairs rather than dense short hairs concentrated adaxially.
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