Abstract
Biatoraalnetorum S. Ekman & Tønsberg, a lichenised ascomycete in the family Ramalinaceae (Lecanorales, Lecanoromycetes), is described as new to science. It is distinct from other species of Biatora in the combination of mainly three-septate ascospores, a crustose thallus forming distinctly delimited soralia that develop by disintegration of convex pustules and the production of atranorin in the thallus and apothecia. The species is known from the Pacific Northwest of North America, where it inhabits the smooth bark of Alnusalnobetulasubsp.sinuata and A.rubra. Biatoraalnetorum is also a new host for the lichenicolous ascomycete Sclerococcumtoensbergii Diederich.
Highlights
During field work in the Pacific Northwest of the United States and Canada in 1995– 2018, the second author came across a distinct crustose and sorediate lichen on the smooth bark of alders
In order to obtain some indication of relationships from other than morphological data, we obtained a complete sequence from the internal transcribed spacer (ITS) region of the ribosomal DNA using the laboratory approach described by Ekman and Blaalid (2011)
The analysis consisted of 10 parallel runs and included a pre-burn-in of 10 iterations followed by 75000 cycles of Markov chain Monte Carlo (MCMC), sampling states every 50 cycles
Summary
During field work in the Pacific Northwest of the United States and Canada in 1995– 2018, the second author came across a distinct crustose and sorediate lichen on the smooth bark of alders. Ascospores produced in the scattered pale-coloured apothecia turned out to be mostly three-septate, which prompted a search amongst the many names once described in or combined into the genus Bacidia De Not. As we were unable to find any previous description of a species fitting this morphology, it is described here as new to science. Morphological characteristics, primarily the combination of the structure of the proper exciple, sorediate thallus and ascospore shape, led us to suspect the new species to be a member of the genus Biatora Fr.
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