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Arctoparmelia Incurva (Pers.) Hale Division: Ascomycota Class: Lecanoromycetes Order: Lecanorales Family: Parmeliaceae

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Arctoparmelia Incurva (Pers.) Hale Division: Ascomycota Class: Lecanoromycetes Order: Lecanorales Family: Parmeliaceae SPECIES FACT SHEET Common Name: Arctoparmelia lichen (a.k.a. powdered rockfrog lichen) Scientific Name: Arctoparmelia incurva (Pers.) Hale Division: Ascomycota Class: Lecanoromycetes Order: Lecanorales Family: Parmeliaceae Technical Description: Thallus stratified, foliose, corticated above and below, upper cortex firm, pale yellowish green (containing usnic acid), dull, lower surface dark, apparently white-pruinose, bearing scattered, short, simple rhizines, medulla white; lobes closely appressed, elongate, averaging to 0.3-0.5 mm wide, thin, soredia confined to large, discrete, orbicular soralia; green algal photobiont. Apothecia located over upper surface, disc brown. Spores simple, ellipsoid, colorless, 8 per ascus. Chemistry: Cortex K+ pale yellow, KC+ yellow; medulla UV+ white, C+ slowly yellow, KC+ reddish. Distinctive features: Soredia present, in discrete, roundish soralia. Similar species: Species of the large genus Xanthoparmelia may be superficially similar to the four recognized species of Arctoparmelia. Hale (1986) separated the latter genus from the former based on the latter’s species always containing alectoronic acid, having a “curious” velvety, ivory-white to purplish lower surface, and in geographic restriction to arctic-boreal regions. Life History: Details for Arctoparmelia are not documented. Presumably, Arctoparmelia incurva is able to colonize new sites via transport of soredia by rainwash, wind or animals. Establishment of new thalli by sexual means is poorly understood in lichens, in general. Range, Distribution, and Abundance: Mainly arctic, circumpolar with rare disjuncts south to southern British Columbia and Washington Cascades. The Consortium of Pacific Northwest Herbaria lists a single collection (no date) from Lava Spring, Mt. Adams Wilderness, Gifford Pinchot National Forest. It is reasonable to suspect the presence of Arctoparmelia incurva at subalpine and alpine elevations in National Forests along the Cascade crest in both Oregon and Washington. Habitat Associations: Lava rock within lava flow, elevation 4600 ft. Threats: The known site within the Mt. Adams Wilderness Area should be subject to minimal local management threats short of trail maintenance or construction. Conservation Considerations: Consider efforts to relocate the known site and conduct local surveys to better understand extent of the local population. 1 Consider periodic monitoring visits to the re-located known site. Consider surveys in appropriate habitats at subalpine and alpine elevations elsewhere in the Washington Cascades and in the central and northern Cascades of Oregon. Consider conducting pre-project surveys for any new trail construction through rocky habitats within the Mt. Adams Wilderness Area, or when trail maintenance is likely to involve disturbance of rock surfaces adjacent to the existing trail. Conservation rankings: G3G5; WANHP S1, proposed endangered; not listed by ORBIC. Preparer: Rick Dewey Date Completed: 6/18/2015 Edited by: Rob Huff Date Completed: 8/5/2015 References: Consortium of Pacific Northwest Herbaria at www.pnwherbaria.org, visited 6/9/2015. Goward, Trevor, Bruce McCune and Del Meidinger. 1994. The Lichens of British Columbia, Illustrated Keys, Part 1 – Foliose and Squamulose Species. Ministry of Forests Research Program. Hale, Mason, Jr. 1986. Arctoparmelia, a new genus in the Parmeliaceae (Ascomycotina). Mycotaxon Vol. XXV, No. 1, pp. 251-254. McCune, Bruce and Linda Geiser. 1997. Macrolichens of the Pacific Northwest. Oregon State University Press in co-publication with the U.S.D.A. Forest Service. Oregon Biodiversity Information Center. 2013. Rare, Threatened and Endangered Species of Oregon. Institute for Natural Resources, Portland State University, Portland, Oregon. Washington State Department of Natural Resources. 2014. Washington Natural Heritage Program Proposed List of Rare Lichens at <www1.dnr.wa.gov/nhp/refdesk/lists/lichens.html> Accessed 6/9/2015. Ways of Enlichenment Photo Gallery @ www.waysofenlichenment.net/lichens 2 Arctoparmelia incurva (Pers.) Hale. Photographed by Curtis Björk in Northwest Territories, Canada, near MacKay Lake, 8/9/2011, on siliceous outcrop in brushy tundra. Photo accessed at http://www.waysofenlichenment.net 3 .
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