Data from: A taxonomic revision of the North American species of Lepraria s.l. that produce divaricatic acid, with notes on the type species of the genus L. incana.

The divaricatic acid-producing populations of Lepraria in North America north of Mexico are revised using traditional morphological characters, chemistry, ecology, biogeography, and ITS1, 5.8S, and ITS2 sequence data. Three taxa are accepted: L. cryophila, L. hodkinsoniana sp. nov., and L. pacifica sp. nov. Both Lepraria crassissima and L. incana are excluded from the study area. Non-cryptic, semi-cryptic, and fully-cryptic species concepts in Lepraria are discussed with a special emphasis on the practical integration of molecular characters into taxonomic frameworks based on non-molecular characters.

本研究基于传统形态学特征、化学特征、生态学特征、生物地理学特征以及内部转录间隔区1（ITS1）、5.8S rRNA基因及内部转录间隔区2（ITS2）序列数据，对墨西哥以北北美地区产歧枝酸（divaricatic acid）的粉芽衣属（Lepraria）类群开展了分类学修订。本研究共承认3个分类群：嗜冷粉芽衣（L. cryophila）、霍奇金森粉芽衣新种（L. hodkinsoniana sp. nov.）以及太平洋粉芽衣新种（L. pacifica sp. nov.）。厚粉芽衣（Lepraria crassissima）和灰白粉芽衣（L. incana）被排除出本研究区域。此外，本文还讨论了粉芽衣属内非隐存、半隐存及全隐存物种的概念，并特别强调了如何将分子特征切实整合到基于非分子特征的分类学框架中。