A New Circumscription for the Common and Widespread North American Species Physcia subtilis, and Description of a New Species, P. thomsoniana
Esslinger TL. 2017. A New Circumscription for the Common and Widespread North American Species Physcia subtilis, and Description of a New Species, P. thomsoniana. Opuscula Philolichenum. 16:139-152
ABSTRACT: The common eastern North American species Physcia subtilis is shown to be heterogeneous and to consist of at least two distinct species, one of them smaller, with consistently narrow lobes and a top to bottom paraplectenchymatous thallus anatomy, and the other an often larger species, with lobes varying from narrow to considerably broader, and a more typical thallus anatomy with a medulla composed of distinct hyphae. Based on the type material and protologue, the name P. subtilis belongs to the less common, smaller species, and the other taxon is here described as the new species, P. thomsoniana.
- Type
- Journal Article
- Authors
- Esslinger, Theodore
- Units
- BISO , DEWA , GRSM , LIRI , PIPE , SHEN
- Keywords
- APHN, Appalachian Highlands Network, Great Smoky Mountains National Park, GRSM, GRSM-00825, lichens, macrolichens, new species, Physcia subtilis, Physcia thomasoniana, Physciaceae, SER, Southeast Region, taxonomy, thallus tissues