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, A.F., Elvebakk, Arve, Anderson, F.L., Gagnon, J.Y.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press 2019
• Subjects: VDP::Mathematics and natural science: 400::Zoology and botany: 480; VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480; Arctic; Canada; Keglo Bay; Ungava Bay
• Online Access: https://hdl.handle.net/10037/18052; https://doi.org/10.1017/S0024282919000288

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.