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19 September 2013 Taxonomic investigations of Lecanora strobilina and L. symmicta (Lecanoraceae, Lecanorales) in northeastern North America
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Abstract
Two members of the Lecanora varia group (sensu Eigler), L. strobilina and L. symmicta, can be difficult to distinguish in northeastern North America. Morphological and chemical investigation of 277 specimens recognizes two species in northeastern North America, both fitting European concepts of L. strobilina and L. symmicta. The only reliable character for separating them is the size of the exciple (consistently larger in L. symmicta). Within each of these two species, previously unknown chemical variation is revealed—L. strobilina comprises three distinct chemotypes, while L. symmicta includes two. An isotype of L. symmictera is shown to contain the thiophanic acid chemosyndrome by HPLC, and hence the name L. symmictera cannot be applied to the xanthone-deficient chemotype of L. symmicta. Chemistry is not correlated with morphology or geographic distribution in either L. strobilina or L. symmicta, so we regard the chemotypes of these two species as intraspecific variation.
The American Bryological and Lichenological Society, Inc.
Scott LaGreca and H. Thorsten Lumbsch "Taxonomic investigations of Lecanora strobilina and L. symmicta (Lecanoraceae, Lecanorales) in northeastern North America," The Bryologist 116(3), (19 September 2013). https://doi.org/10.1639/0007-2745-116.3.287
Received: 29 March 2013; Accepted: 1 August 2013; Published: 19 September 2013
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