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Lichens and Allied Fungi of Hall's Gullies: A Hotspot for Rare and Endangered Species in Newfoundland, Canada

Richard Troy McMullin1,* and André Arsenault2

1Canadian Museum of Nature, Research and Collections, PO Box 3443 Stn “D”, Ottawa, ON K1P 6P4, Canada. 2Natural Resources Canada, Canadian Forest Service - Atlantic Forestry Centre, Corner Brook Office PO Box 960, 20 University Drive, Corner Brook, NL A2H 6J3, Canada. *Corresponding author.

Northeastern Naturalist, Volume 26, Issue 4 (2019): 729–748

Abstract
Biodiversity hotspots are regions with high numbers of rare species that are conservation priorities. Hall’s Gullies is a region on the Avalon Peninsula in Newfoundland, Canada, that is well known for a large population of Erioderma pedicellatum, a lichen that is listed globally as critically endangered by the International Union for Conservation of Nature. To determine if there are other species of conservation interest in this region, we completed a detailed survey of the lichens and allied fungi. We combined our results with historical collections and report 179 species in 86 genera, which include 18 cyanolichens and 20 calicioids. Three species are listed on the federal Species at Risk Act: Degelia plumbea, Erioderma mollissimum, and E. pedicellatum. Fifteen species discovered during our study were new to Newfoundland and Labrador. Eleven of those species (the calicioids) we reported in a previous publication, but 4 are reported here for the first time from the province: Abrothallus santessonii, Biatora chrysantha, Heterodermia neglecta, and Plectocarpon scrobiculatae. Hall’s Gullies is a hotspot for rare lichen species, but it is not legally protected and, as a result, should be a conservation priority.

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