Asplenium formosum Willd.

  • Authority

    Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.

  • Family

    Aspleniaceae

  • Scientific Name

    Asplenium formosum Willd.

  • Description

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    Species Description - Rhizome ascending; rhizome scales bicolorous, central portion black, occluded, margin clathrate, light brown, 1.5-2 mm long, 0.3-0.5 mm wide, linear-lanceolate (acicular); fronds clumped; stipe (6-) 12-15 mm long, lustrous with narrow wings (0.1-0.3 mm wide), rare hairlike scales 1-2 mm long; blade once-pinnate, linear, (6-) 15-30 cm long, 2-3.5 cm wide, pinnatifid apex non-proliferous, reduced at base; rachis lustrous, black to dark brown, wing (0.1-0.3 mm wide) green; pinnae 25-30 pairs, sessile, oblong, (6-) 10-18 mm long, 3-6 mm wide, acute, cuneate, base inequilateral, dimidiate, superior margin bidentate, sinuses 1-3 mm deep; veins forked, hydathodes prominent; sori mostly 1-2(-3) per pinna, usually parallel to lower margin; indusia 2-3 mm long, 0.5-0.8 mm wide, entire.

  • Discussion

    Type. Venezuela. Caracas, Bredemeyer s.n. (B-Willd. 19908!, photo US!). Asplenium subalatum Hooker & Amott, Bot. Beechey Voy. 312, t. 71. 1838. Type. Mexico. Nayarit: Tepic, Dec 1827-Feb 1828, Lay s.n. [Beechey] (K!). Asplenium formosum is distinguished by the deeply incised acroscopic pinna margin and its frequent occurrence on moist rocks by streams at low elevations.

  • Distribution

    Terrestrial or epipetric, especially on rocks near streams at low elevations; Choapan, Ixtlán, Juchitán, Juquila, Mixe, Pochutla, Putla, Tuxtepec; 100-1250 m. Mexico (Dgo, Nay, Jal, Col, Mich, Gro, Mor, Ver, Oax, Chis, Tab); Guat to Pan; WI; Col & Ven to Arg & Parag.

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