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Psoroma nivale (Pannariaceae, lichenized Ascomycota) a new species with dark, elongate squamules and bacilliform ascospores from arctic Québec, Canada

Published online by Cambridge University Press:  04 November 2019

Alan M. FRYDAY
Affiliation:
Herbarium, Department of Plant Biology, Michigan State University, East Lansing, MI 48824, USA. Email: fryday@msu.edu
Arve ELVEBAKK
Affiliation:
Tromsø University Museum, University of Tromsø – the Arctic University of Norway, P.O. Box 5060 Langnes, NO-9037 Tromsø, Norway.
Frances L. ANDERSON
Affiliation:
273 Crouse's Settlement Rd, Upper LaHave, NS, B4V 0G4, Canada.
Jean Y. GAGNON
Affiliation:
Ministère des Forêts, de la Faune et des Parcs, Direction des Parcs Nationaux, 880 chemin Ste–Foy, local 2.5, Québec, QC, G1S 4X4, Canada.
Corresponding
E-mail address:

Abstract

The new species Psoroma nivale is described from an area of late snow-lie in the Keglo Bay area on the eastern side of Ungava Bay, northern Québec, Canada. It is superficially similar to P. hypnorum but has a dark, brownish black thallus colour without reddish hues, much-branched, proliferating squamules, thick paraphyses, distinct but inconspicuous IKI+ ascus tube structures, and characteristic elongate, bacilliform, often asymmetrical ascospores. The new species is compared with possible related taxa and its systematic position discussed. A key to the species of pannarioid lichens reported from arctic areas of North America is also provided.

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Articles
Copyright
Copyright © British Lichen Society 2019 

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Psoroma nivale (Pannariaceae, lichenized Ascomycota) a new species with dark, elongate squamules and bacilliform ascospores from arctic Québec, Canada
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