Flora of Barro Colorado Island

Metaxya rostrata

 (H. & B. ex Willd.) Presl, Tent. Pterid. 60.1836

Alsophila rostrata Mart.

Terrestrial, lacking a trunk; rhizome with a single si­phonostele, densely pubescent with long yellowish    tri­chomes (also a few at base of petiole). Leaves 1-pinnate, to ca 2 m long but arch-ascending, the apex usually droop­ing; petioles ca 50 cm long; rachis yellowish, dull; leaflets linear-oblong, caudate-acuminate, acute to obtuse and sometimes inequilateral at base, 10-32 cm long, 2-3.5 cm wide, the veins free or forked once usually near midrib, the margin entire except crenate near apex. Sori ± round, on veins in an irregular pattern on either side of midrib. Croat 9527.

Rare, seen only twice; probably restricted to ravines. Apparently fertile throughout the year.

Easily confused in sterile condition with Saccoloma elegans (10. Polypodiaceae), which has marginal sori, but distinguished by having the margins entire (except near apex), the veins rarely forked (except near base), the rachis yellowish and dull, and the rhizome clothed with dense yellow trichomes.

Guatemala to Peru, Bolivia, and Brazil; West Indies. In Panama, known from tropical moist forest on the Atlantic slope in the Canal Zone, Bocas del Toro, and Colón; known also from tropical moist and premontane wet forests in Panama.

See Fig. 10.