A morpho-molecular revision of Leucoloma (Dicranaceae, Bryophyta) in Brazil
Gama, Renato; Stech, Michael; Schäfer-Verwimp, Alfons; Peralta, Denilson F.
The pantropical haplolepideous moss genus Leucoloma is represented in Brazil with nine species, six of which are endemic. However, no taxonomic treatment or identification key for the Brazilian species is available, which is an impediment for their identification. In the present study we used molecular data from the nuclear ribosomal ITS1-5.8S-ITS2 and two chloroplast regions (rps4-trnT-trnL-trnF and atpB-rbcL) together with a taxonomic revision based on morphological characters to test the circumscriptions of Leucoloma species occurring in Brazil and to provide tools to enable their identification. Four monophyletic lineages were reconstructed by molecular phylogenetic analysis with significant support. These lineages correspond to four Leucoloma species that can be easily recognized morphologically: L. cruegerianum, L. serrulatum, L. tortellum and L. triforme. It is concluded that these four species are the only Leucoloma species that occur in Brazil, and that L. triforme is the only species endemic to Brazil. Based on the taxonomic revision we propose the synonymization of L. mosenii, L. mosenii f. fuscescens and L. theriotii with L. cruegerianum as well as of L. aduncum and L. caldense with L. serrulatum. The type of L. itatiaiense was not seen, therefore its status remains unknown.