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North American Lichen Herbaria
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Megaspora verrucosa (Ach.) Hafellner & V. Wirth  
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Family: Megasporaceae
[Amygdalaria verrucosa (Ach.) Körb., moreAspicilia mutabilis (Ach.) Körb., Aspicilia mutabilis f. corticola Norman, Aspicilia mutabilis f. mutabilis (Ach.) Körb., Aspicilia verrucosa (Ach.) Körb., Aspicilia verrucosa f. corticola-asiatica Gintovt, Aspicilia verrucosa f. rugulosa Norman, Aspicilia verrucosa f. verrucosa (Ach.) Körb., Aspicilia verrucosa subsp. mutabilis (Ach.) Cl. Roux, Aspicilia verrucosa subsp. verrucosa (Ach.) Körb., Gussonea verrucosa (Ach.) Trevis., Lecanora urceolata (Anzi) Nyl., Lecanora verrucosa (Ach.) Laurer, Lecanora verrucosa f. rugulosa Norman, Lecanora verrucosa f. verrucosa Ach., Pachyospora mutabilis (Ach.) A. Massal., Pachyospora verrucosa (Ach.) Massal., Parmelia verrucosa (Ach.) Spreng., Pertusaria freyi Erichsen, Pertusaria freyi subsp. freyi Erichsen, Pertusaria freyi subsp. monosticha Erichsen, Pertusaria freyi var. freyi Erichsen, Pertusaria freyi var. monosticha (Erichsen) Erichsen, Urceolaria mutabilis Ach., Urceolaria scruposa var. verrucosa (Ach.) Schaer., Urceolaria verrucosa Ach.]
Megaspora verrucosa image
Stephen Sharnoff  
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Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus crustose, olive-green to whitish green, partly slightly pruinose, continuous to areolate to strongly verrucose-warty, lacking soredia or isidia; hypothallus indistinct. Apothecia immersed in areolae, appearing like Pertusaria; disk black, concave deeply, at first ostiolate, becoming broader, with a thin darkening border around ostiole within thalloid margin; hypothecium pale yellowish or brownish; epithecium K—, HC1—, HN03—; hymenium hyaline, inspersed at times, 1+ blue; paraphysoids slender, 1.5 µm, branched but not anastomosing, lax, tips only slightly thickened, not much darkened; asci clavate; spores 8, biseriate, thin-walled, wall single, ellipsoid, often containing oil drops, walls K—, 30-65 X 16-36 µm.

Reactions: K—, C—, KC—, P—.

Contents: unknown.

This species grows on moss, humus, and soil in the Arctic but also on tree trunks toward the southern edge of the range. It is circumpolar arctic-alpine; and boreal, and also occurs in the Andes in South America. In North America it ranges south to North Carolina, Minnesota, New Mexico, and California.

Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Substrate and ecology: var. verrucosa on humus and litter, or soil or bryophytes; especially on calcareous substrates, including limestone, but also over volcanic and other siliceous rocks; mostly subalpine to alpine, World distribution: Europe, Macaronesia, Asia, South America, and North America Sonoran distribution: not currently known but in adjacent Rocky Mountain states.
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Megaspora verrucosa
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Stephen Sharnoff  
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Stephen Sharnoff  
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Stephen Sharnoff  
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Stephen Sharnoff  
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394