Novas adições ao conhecimento da flora hepática (Hepaticae, Bryophyta) da Estação Científica Ferreira Penna, na Floresta Nacional de Caxiuanã, Pará

Abstract

This work is a continuation of the study of the liverwort flora of the Scientific Station Ferreira Penna (ECFPn). Its main objective is to test the hypothesis that a high specific diversity of this group occurs, as already determined for the arboreal flora. The methodology consisted in collecting liverworts from different ecosystems in the ECFPn area, such as várzea forests, igapós, dense terra firme forests, savanna vegetation and shrublands. For each collection, substrate data and types of associations were recorded. After drying the material, identification was carried out using specialized bibliography and comparison with identified material from the MG herbarium. The results show the occurrence of 64 species, 37 genera and 6 families of liverworts, distributed in 719 specimens. The family Lejeuneaceae stood out both in diversity of species and number of occurrences. The genera Lejeunea and Ceratolejeunea, of the family Lejeuneaceae, are represented by 7 and 5 species, respectively. Ceratolejeunea comuta (Lindenb.) Schíffn., Tracbylejeunea aneogyna (Spruce) Grolle, Xylokjeunea crenata (Nees & Mont.) X.-L.He, Ceratolejeunea coarina (Gottsche) Stephani and Cbeilolejeunea rigidula (Nees & Montagne) Schuster were the most frequent species, with 73, 48, 43, 42 and 37, respectively. The corticolous substrate and the dryland forest ecosystem are the sites of greatest occurrence of the species. Five species were collected occurring in all substrate types and 13 in all ecosystems studied. Apbanolejeunea costaricensis A.Lücking, a species only previously reported for Costa Rica, is mentioned for the first time for Brazil.