The saxicolous species of the genus Usnea subgenus Usnea (Parmeliaceae) in Argentina.

JUAN MANUEL RODRIGUEZ; CECILIA ESTRABOU; CAMILLE TRUONG; PHILIPPE CLERC

BRYOLOGIST

AMER BRYOLOGICAL LICHENOLOGICAL SOC INC

Año: 2011 vol. 114 p. 504 - 525

0007-2745

Eight primarily saxicolous Usnea subgenus Usnea species are reported from Argentina and Uruguay U. amblyoclada (Müll. Arg.) Zahlbr. (syn. nov. U. pinnata Räsänen), U. densirostra Motyka, U. durietzii Motyka (syn. nov. U. caespitia Motyka), U. exigua J.M. Rodr. & P. Clerc sp. nov., U. fastuosa (Müll. Arg.) Zahlbr., U. hieronymii Kremp. (syn. nov. U. hieronymii var. adusta Kremp.), U. lutii J.M. Rodr. & P. Clerc sp. nov. and Usnea saxidilatata J.M. Rodr. & P. Clerc sp. nov. are described with morphological, anatomical and chemical data. Their taxonomy and distribution are discussed. A key to the saxicolous species, including those occurring secondarily on rocks (i.e., U. columbiana Motyka, U. cornuta Körb., U. dasaea Stirt. and cf. U. perhispidella J. Steiner) is provided.