No abstract

Leptogium subjuressianum and L. subjuressianum var. caparoense are new Brazilian taxa growing mostly in the southeastern mountains. They are differentiated from European taxa by the ornamentation of the upper surface.

No abstract

-(A new hairy Leptogium (section Mallotium) from Rio Grande do Sul State, Brazil). The hairs of Leptogium species are complex structures which determine taxonomic groups within the section Mallotium. The hairs composed of cylindrical cells can be short and, when present on the surface, give origin to glass-or velvet-like hairs. Leptogium involutum, collected in Southern Brazil, a new species with velvet-like hairs is described herewith. Keywords: cylindrical cells, involute margin, Leptogium velutinum RESUMO -(Uma nova espécie de Leptogium com pêlos (seção Mallotium) do Estado do Rio Grande do Sul, Brasil). Os pêlos das espécies de Leptogium são estruturas complexas que podem determinar grupos dentro da seção Mallotium. Os pêlos compostos de células cilíndricas podem ser curtos e, quando presentes oferecem a superfície uma aparência brilhante (como vidro) ou aveludada. Leptogium involutum, coletada na região Sul do Brasil, uma espécie nova com pêlos aveludados é descrita aqui. Palavras-chave: células cilíndricas, Leptogium velutinum, margem involuta

With more than 180 known species, Leptogium has its greatest richness in tropical regions. Only three species have so far been reported from Antarctica but extensive surveys in the Antarctic Maritime Islands have shown that this is an underestimate. Leptogium antarcticum (non-isidiate, with medulla composed of columnar hyphae), L. marcellii (non-isidiate, with medulla composed of a sponge-like arrangement of hyphae) and L. tectum (isidiate, with medulla composed of columnar hyphae) are described here as new to science. The new species are compared with those already reported for the genus in Antarctica, namely L. crispatellum, L. menziesii and L. puberulum, and an identification key is provided. Sequences of ITS and mrSSU regions were obtained from recently collected L. antarcticum, L. marcellii, L. puberulum and L. tectum specimens. Morphological and anatomical data were compared along with available genetic data in order to delimit these species more accurately, using an integrative approach.

O levantamento de espécimes de liquens foliosos do Parque Estadual da Cantareira e arredores depositados no herbário SP inclui 14 espécimes de cianoliquens, pertencentes à sete espécies dos gêneros Coccocarpia, Collema e Leptogium. Este é o primeiro registro dessas espécies para a área, sendo apresentadas uma chave de identificação, descrições, comentários e ilustrações. Collema fuscovirens é citado pela primeira vez para a América do Sul, Leptogium coralloideum pela primeira vez para o Estado de São Paulo e o lectótipo de L. austroamericanum é designado.

Specimens of leptogium collected in ten localities from the State of Rio Grande do Sul were studied. Sixteen species were found of 28 records mentioned to the state, which represents around 57% of the Leptogium diversity known for Rio Grande do Sul. leptogium exaratum is proposed as a new species. Leptogium atlanticum, L. milligranum and L. vesiculosum are reported for the first time to the state. The lectotype of l. javanicum is reported here and detailed descriptions are provided to the examined specimens. An identification key is showed with all the 28 mentioned species of Leptogium. It is the first published taxonomic key for Leptogium from Rio Grande do Sul, the State with the highest diversity of this genus in Brazil.

A survey of cyanolichen species occurring in Cananéia, Cardoso, Comprida and Ilhabela Islands of São Paulo State, Brazil, revealed the occurrence of sixteen species belonging to the genus Leptogium. The survey is based on literature review and on newly collected material. Two species (L. milligranum and L. sulcatum) are newly reported for Brazil and two others (L. atlanticum and L. denticulatum) for the studied islands, while L. azureum, L. cyanescens, L. isidiosellum and L. moluccanum were recollected by us. Descriptions for all insular species, along with an identification key are also presented.