Asplenium rhomboidale Desv.

  • Authority

    Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.

  • Family

    Aspleniaceae

  • Scientific Name

    Asplenium rhomboidale Desv.

  • Description

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    Species Description - Rhizome curved-ascending to erect, 4-5 mm thick, at apex bearing a tuft of blackish, densely clathrate, lance-attenuate scales 2-4 mm long. Fronds very numerous (up to 50 per plant), densely clustered, ascending, (12-)20-35 cm long; stipes relatively short, 2.5-7 cm long, dull brown, 2-marginate or very narrowly 2-winged adaxially. Blades linear-attenuate, glabrous, (8-) 18-32 cm long, 2-3.5 cm broad near the middle, tapering gradually both ways, the apex often longacuminate; rhachis dull brown, narrowly greenwinged; pinnae (12-)30-40 pairs, sessile, the proximal ones reduced and apart, the middle ones close, trapeziform-oblong, 1-1.8 cm long, rounded- obtuse at apex, 4-7 mm broad at the straight inner margin of the subrectangular, unequal, broadly cuneate base, subauriculate on acroscopic side, the margins crenate-senate; veins oblique, mostly simple except the basal acroscopic ones; tissue dark green, thin-herbaceous, semitranslucent. Sori narrowly elliptic to linear, up to 5 mm long, the basal acroscopic one often diplazioid; indusium pale brown, membranous, with entire margin.

    Distribution and Ecology - General Distribution. Greater Antilles. Distribution in Puerto Rico. Known from scattered localities in the Cordillera Central; recorded from Adjuntas, Barranquitas, Ciales, Jayuya, Peiiuelas, San German, Utuado, and Yauco. Habitat. Shaded mossy boulders and ledges at high elevations (900-1120 m), rare and sporadic.

  • Discussion

    Type. Plumier, Traite foug. Amer., t. 65, based on a plant from Hispaniola.

    Syn. Asplenium lunulatum var. parvulum Jenman, Bull. Bot. Dept, Jamaica no. 49: 6. 1893. (Type. Jenman, from the parish of Portland, Jamaica, not seen.)

    Asplenium sintenisii Hieronymus, Hedwigia 60: 251. 1918. (Lectotype. Sintenis 2071, from Monte Torrecilla, Puerto Rico, B, isotype US.)