As briófitas da ilha da trindade, atlântico sul, Brasil

Abstract

Trindade is a Brazilian oceanic island located about 1,200 Km east of the Brazilian coast (between 20o 31′ 30″ S, 29o 19′ 30″ W). The island originated from the abissal zone about 3 million years ago, has a maximum altitude of 620 meters and an area of 9.28 Km2. Even though the fanerogamic flora is known, there were virtually no data on the bryophyte flora. Four expeditions to the island were carried out during two years and approximately 431 specimens collected. This work presents the Bryoflora of this island, which comprises 32 species, including 20 species of liverworts distributed among six families; the most speciose being Lejeuneaceae with 11 species and Frullaniaceae with four. There are also 11 species of mosses distributed among eight families, the most diverse being Fissidentaceae, Leocobryaceae and Pottiaceae with two species each. Only one species of hornworts was found. The bryophyte flora of Trindade most likely originated from the threatened Atlantic Forest of southeastern Brazil and, therefore, has conservation implications. Keys and comments are provided.