Hawaii. Its distribution also includes Mexico, Central and South America, the Caribbean, Africa, and the Azores.In the Hawaiian Islands,
indigenous to
Maui, Hawai`i.
Fronds stiffly upright, 18-42 x 1-3 cm, occasionally proliferous on upper stipes or lower rachises; stipes close, clustered, short, 1/10-1/5 frond length, dark brown to black, shiny, scales at base lanceolate; blade 1-pinnate, long, narrow, linear-lanceolate; rachises dark brown to black, glabrous, shiny; pinnae 20-60 pairs, somewhat oblong-rectangular, strongly dimidiate, medium to dark green, coriaceous, acroscopic basal portion slightly auriculate, distal margins crenate, tips rounded or crenate, lower pinnae distant and shorter, semicircular.
Sori
Sori usually only 1 per pinna on lower margin, sometimes more, and 1-2 on upper margin; indusia thin.
Notes
Greek mono-, one, + antheros, anther, in reference to the usually single sorus on the pinnae.