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.

Calyptostoma velutinum (Müller, 1776) (Acari, Actinotrichida, Parasitengona) s. lato na tle Calyptostomatoidea świata

Wydział Biologii i Hodowli Zwierząt Uniwersytet Przyrodniczy we Wrocławiu

The Leptogium juressianum complex in southeastern Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estudo taxonômico de Leptogium (ACH.) S.F. Gray (Collemataceae, fungos liquenizados)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A revision of Leptogium species with spherical-celled hairs (section Mallotium p.p.)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Leptogium denticulatum (Collemataceae, lichenized Ascomycota) and some morphologically related species

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Plant species, biomass and environmental characteristics of relevés along the North America Arctic bioclimate gradient

Question: How do interactions between the physical environment and biotic properties of vegetation influence the formation of small patterned-ground features along the Arctic bioclimate gradient? Location: At 68° to 78°N: six locations along the Dalton Highway in arctic Alaska and three in Canada (Banks Island, Prince Patrick Island and Ellef Ringnes Island). Methods: We analysed floristic and structural vegetation, biomass and abiotic data (soil chemical and physical parameters, the n-factor [a soil thermal index] and spectral information [NDVI, LAI]) on 147 microhabitat releves of zonalpatterned-ground features. Using mapping, table analysis (JUICE) and ordination techniques (NMDS). Results: Table analysis using JUICE and the phi-coefficient to identify diagnostic species revealed clear groups of diagnostic plant taxa in four of the five zonal vegetation complexes. Plant communities and zonal complexes were generally well separated in the NMDS ordination. The Alaska and Canada communities were spatially separated in the ordination because of different glacial histories and location in separate floristic provinces, but there was no single controlling environmental gradient. Vegetation structure, particularly that of bryophytes and total biomass, strongly affected thermal properties of the soils. Patterned-ground complexes with the largest thermal differential between the patterned-ground features and the surrounding vegetation exhibited the clearest patterned-ground morphologies.