As part of the survey of the myxobiota of Sergipe, the abundance and constancy of the Trichiales found in different microhabitats and altitudes in the Serra de Itabaiana National Park (10º40'52"S and 37º25'15"W; 7,966 ha) were evaluated. Two physiognomic types predominate: humid forests found at the edge of creeks, and open areas with sandy soils, grasses, sedges, cacti, bromeliads and shrubs. Sporocarps were collected over a two-year period (19 field trips); dead wood, litter, bark and dung of Sylvilagus brasiliensis L. were collected for moist-chamber cultures (590). Ten species were identified: Arcyria cinerea (Bull.) Pers., A. denudata (L.) Wettst., A. obvellata (Oeder) Onsberg, Hemitrichia calyculata (Speg.) M. L. Farr, H. minor G. Lister, H. serpula (Scop.) Rostaf. ex Lister, Metatrichia vesparia (Batsch) Nann.-Bremek. ex G. W. Martin & Alexop., Perichaena chrysosperma (Curr.) Lister, P. depressa Lib., and Trichia affinis de Bary. Trichiales were present in six microhabitats, and lignicolous and foliicolous species were predominant. Three fimicolous species were recorded: A. cinerea, H. minor and M. vesparia. The most constant and abundant species were A. cinerea, A. denudata, and H. calyculata, which were found at different altitudes (180-670 m). Descriptions are given for each species as well as their geographic distribution in Brazil. A. denudata, A. obvellata, H. calyculata, P. chrysosperma, and T. affinis are new records for Sergipe, raising to 58 the number of Myxomycetes species recorded for this state.
biodiversity; Myxomycetes; Neotropics; taxonomy
