Sundue, M. A. (Institute of Systematic Botany, The New York Botanical Garden, Bronx, NY 10458–5126, U.S.A.; msundue@nybg.org) & J. Prado (Instituto de Botânica, Caixa Postal 4005, 01061-970, São Paulo, Brazil; jprado@dialdata.com.br). Adiantum diphyllum, a rare and endemic species of Bahia State, Brazil, and its close relatives. Brittonia 57: 123–128. 2005.—Adiantum diphyllum, a species endemic to the coastal forests of Bahia State, Brazil, is characterized and distinguished from other species of Adiantum with anastomosing veins, elongate sori, and venuloid idioblasts.

Sundue, M. A. (Institute of Systematic Botany, The New York Botanical Garden, Bronx, NY 10458-5126, U.S.A.; msundue@nybg.org) & J. Prado (Instituto de Botânica, Caixa Postal 4005, 01061-970, São Paulo, Brazil; jprado@dialdata.com.br). Adiantum diphyllum, a rare and endemic species of Bahia State, Brazil, and its close relatives. Brittonia 57:123–128. 2005.—Adiantum diphyllum, uma espécie endêmica das florestas costeiras do leste do Brasil, é caracterizada e distinta das outras espécies de Adiantum com nervuras anastomosadas, soros alongados e idioblastos entre as nervuras.