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

• Published in: The Lichenologist
• Main Authors: FRYDAY, Alan M., ELVEBAKK, Arve, ANDERSON, Frances L., GAGNON, Jean Y.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2019
• Subjects: Ecology, Evolution, Behavior and Systematics; Arctic; Canada; Ungava Bay; Keglo Bay
• Online Access: http://dx.doi.org/10.1017/s0024282919000288; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0024282919000288

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.