Hymenophyllum myriocarpum Hook.

  • Authority

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

  • Family

    Hymenophyllaceae

  • Scientific Name

    Hymenophyllum myriocarpum Hook.

  • Description

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    Species Description - Rhizomes creeping, ca. 0.5 mm diam.; rhizome hairs centrally attached, sessile, reddish brown, 1.5–2 mm long; fronds subdistant, 10–25 x 1.5–3.5 cm; stipes 1/8–1/5 the frond length, 0.5–0.8 mm diam., alate to bases, glabrous; blades 2–3-pinnatifid, ovate to linear-lanceolate, glabrous; rachises alate; pinnae many, adnate; segments 1–1.3 mm wide, narrowed near forks to 0.5 mm; margins plane, entire, glabrous; involucres round to broadly ovate, 0.8–1 x 1–1.5 mm, greatly constricted at bases (0.5 mm wide) and appearing stalked, margins entire, receptacles not exserted.

  • Discussion

    Mecodium myriocarpum (Hook.) Copel., Philipp. J. Sci. 67: 25. 1938. Type. Colombia. Hartweg 1530 (K!; isotypes LE!, P!).

    Hymenophyllum nigrescens Liebm., Mexic. Bregn. 292 (reprint 140). 1849. Type. Mexico. Puebla: Barrancas around Chinautla, Liebmann s.n. [Pl. Mex. 2139, Fl. Mex. 537, 538] (C!).

    Sphaerocionium nigricans C. Presl ex Klotzsch, Linnaea 18: 536. 1844. Hymenophyllum nigricans (C. Presl ex Klotzsch) Kunze, Bot. Zeitung (Berlin) 5: 244. 1847, hom. illeg., non Colla, 1836. Mecodium nigricans (C. Presl ex Klotzsch) Copel., Philipp. J. Sci. 67: 25. 1938. Syntypes. Venezuela. [Aragua:] Colonia Tovar, Moritz 268, 268b; Peru. Dombey 87 (P!).

    The type specimen of Hymenophyllum nigrescens is a very dark, poorly pressed plant with sori wider than long and constricted proximally, appearing as merely a bad specimen of H. myriocarpum. Among the glabrous hymenophyllums, H. myriocarpum is distinct by the involucres being broader than long and the laminae being greatly constricted below the sori making them appear stalked. Hymenophyllum axillare Sw. of the Greater Antilles (type Jamaica) closely resembles H. myriocarpum in the involucres being wider than long and somewhat contricted below. Further study may show the two to be the same. Fronds occasionally appear indeterminate with irregular development of some distal pinnae.

  • Distribution

    Epiphytic in wet montane forests; 1200–3000 m. Mexico; Guat, Hond, Salv, Nic, CR, Pan; Col, Ven, Guy, Sur, Fr Gui, Ec, Peru, Bol.

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