Lecanora section Placodium (lichenized Ascomycotina) in North America: new taxa in the L. garovaglii group

• Published in: The Bryologist Vol. 96; no. 3; pp. 288 - 298
• Main Authors: Ryan, B.D, Nash, T.H. III
• Format: Journal Article
• Language: English
• Published: Fairfax, VA American Bryological and Lichenological Society 01-01-1993
• Subjects: ANATOMIA DE LA PLANTA; ANATOMIE VEGETALE; Biological and medical sciences; CALIFORNIA; CALIFORNIE; Colors; DISTRIBUCION NATURAL; DISTRIBUTION NATURELLE; ESPECE NOUVELLE; ESPECIES NUEVAS; Fatty acids; Fundamental and applied biological sciences. Psychology; GEOGRAPHICAL DISTRIBUTION; Habitats; Holotypes; Isotypes; KEYS; Lecanora garovaglii; LECANORA SIERRAE, SP. NOV; LECANOVA PSEUDOMELLEA, SP. NOV; LICHEN; LICHENES; Lichens; LIQUENES; NATURAL DISTRIBUTION; NEVADA; NEW SPECIES; PLANT ANATOMY; Plant cytology, morphology, systematics, chorology and evolution; PLANT MORPHOLOGY; Specimens; Symposium: Innovations and Traditions in Lichen Systematics. A Tribute to Mason Hale; Taxa; TAXONOMIA; TAXONOMIE; TAXONOMY; Thallophyta; Thallus; North America; America; USA, Northwest; USA, California; Geographic distribution; Taxonomy; Morphology; Chemotaxonomy; Diagnosis (taxonomy); Lichenes; Taxonomic key; New species; Habitat; Thallophyta
• ISSN: 0007-2745; 1938-4378
• DOI: 10.2307/3243856

The Lecanora garovaglii group (subg. Placodium sect. Placodium) typically has inflated, sinuous and plicate lobes, and the upper cortex lacks distinct conical bundles of hyphae. The L. garovaglii complex itself, centered around L. garovaglii (Körber) Zahlbr. (syn. L. peruviana (Müll. Arg.) Zahlbr.), includes material first described as L. cascadensis Magnusson (syn. L. nevadensis Magnusson), which differs mainly by disc colors and epihymenial characters often modified by light conditions and parasitism. As treated in this article, L. garovaglii s.l. also includes several overlapping cortical chemotypes. A second complex centers around two new species (previously misidentified as L. cascadensis or other taxa). Lecanora sierrae Ryan & Nash, found mainly at high elevations in California, and Lecanora pseudomellea Ryan, found mainly at intermediate elevations in the Northwest, are new species, treated broadly to include a typical medullary chemotype (fatty acids only) but also chemotypes containing in addition either pannarin or psoromic acid.