Journal
FUNGAL BIOLOGY
Volume 125, Issue 7, Pages 495-504Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2021.01.007
Keywords
Ascomycota; Lichinales; Metagenome; Nomenclature; Phylogenetic analysis; Systematics
Categories
Funding
- Minciencias (Colombia)
- NSERC Discovery Grant (Canada)
- Tier II Canada Research Chair in Symbiosis
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The article reports the reclassification of the lichen originally misapplied as "Lecidea lichenicola" into a new genus Watsoniomyces; it is found not to be a specialist of chalk pebbles as previously thought; and describes for the first time a member of the class Lichinomycetes with an endolithic thallus.
The lichen, to which the name Lecidea lichenicola is found to have been misapplied, was first described from England and is an extreme specialist of chalk pebbles. It has long been known that it is not closely related to Lecidea in the strict sense, but its true evolutionary relationships have been unknown. Here we use metagenome-assembled genome data to place this fungus in a six-locus phylogeny of Ascomycota, and find strong support for its placement in the class Lichinomycetes. Multiple gene trees using existing data from Lichinomycetes support its further placement within the family Lichinaceae. Based on a revision of types and original descriptions, we conclude that the earliest name for this species is Lecidea obsoleta (syn. Thrombium cretaceum). We neotypify that name by a modern collection and accommodate it in the new genus Watsoniomyces. Type and other original material of L. lichenicola (syn. Discocera lichenicola) was re-examined and found not to be on chalk and to represent a different lichen, Trapelia glebulosa. Watsoniomyces is the first described member of Lichinomycetes with an endolithic thallus. (c) 2021 British Mycological Society. Published by Elsevier Ltd. All rights reserved.
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