Adiantopsis seemannii (Hook.) Maxon

  • Authority

    Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.

  • Family

    Pteridaceae

  • Scientific Name

    Adiantopsis seemannii (Hook.) Maxon

  • Description

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    Species Description - Rhizomes short, stout, ascending; rhizome scales 5 x 0.5–0.8 mm, each bicolorous with black center and brown margins, varying to dark brown, hair-like scales 1 mm long; fronds to 65 cm tall, clumped; stipes 1/3–1/2 of the frond length, atropurpureous, lustrous, glabrous, terete; blades bipinnate-pinnatifid to tripinnate, pinnately arranged, deltate, rachises terete to shallowly grooved, glabrous, the costae grooved adaxially, with brown wings; adaxial surfaces glabrous, papillate with dark vein ends; abaxial surfaces with sparse, clavate, white hairs less than 0.1 mm long; veins visible; sori ca. 0.5 mm long; indusia pale with white cells on outer surfaces, thin, broken into flaps, 0.5– 0.8 x 0.3–0.5 mm; spores tan.

  • Discussion

    Cheilanthes seemannii Hook., Sp. Fil. 2: 85, t. 97A. 1852. Type. Northwest Mexico. Seemann 1931 (mixed with Cheilanthes microphylla) (K!, frag. NY!). These specimens were previously treated as A. chlorophylla (Sw.) Fe´e (Mickel & Beitel, 1988; Mickel 1992), but apparently that species is limited to southern Brazil, Paraguay, and Bolivia. Typically, A. chlorophylla has castaneous to black-centered rhizome scales, castaneous frond axes, and sori 2–3 mm long along the segment margins, as opposed to A. seemannii which has rhizome scales entirely black (or nearly so), frond axes black, and sori only 1mmlong. Andean material identified as A. chlorophylla may be distinct from both A. seemannii and A. chlorophylla.

  • Distribution

    Lowland wet forests; 100–1400 m. Mexico; Guat, Bel, Hond, Nic, CR, Pan.

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