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Stereocaulon grande (H. Magn.) H. Magn.
Family: Stereocaulaceae
Stereocaulon grande image
Stephen Sharnoff  
Thompson, J., 1984. American Arctic Lichens: The Macrolichens.
Primary thallus disappearing; pseudopodetia 4-8 cm tall, in loose growths, the base to 2 mm thick, slowly tapering to the apices, with few and short branches, the main axis dominant to the tip, pale roseate tomentose; phyllocladia distributed in groups along the pseudopodetia, clearly coralline, larger than in S. paschale, 0.4-0.8 mm long, 0.2 mm in diameter, not as coalescent as in S. alpinum; cephalodia common, small, low, pale brown, tomentose, containing Nostoc. Central strand of the pseudopodetium quite loose; hyphae 3-4.5 µ, thinner walled than in S. alpinum and thicker walled than in S. paschale; cortex of phyllocladia thin, 15-20 µ, hyphae 3-4 µ thick. Apothecia 2 mm broad, flat and margined then slightly swollen and with reflexed margin; disk blackish-brown, underside tomentose; hypothecium 40-50 µ thick, 1+ blue; hymenium 50-60 µ, I blue; paraphyses 1-1.5 µ, capitate, tips to 4.5 µ; asci 8 spored, 42-52 x 8-10 µ; spores 4-5 celled, one end thicker, often slightly bent, 20-44 x 2-3 µ. Conidia 5-6 x 0.6 µ.

Reactions: KOH+ yellow, P— .

Contents: atranorin and lobaric acid.

This species grows among mosses and in tundras over gravel soils. It is low arctic and circumpolar boreal, in North America occurring trans-Canada and in Alaska, south to Maine, New Hampshire and Oregon (Lamb 1977).

Stereocaulon grande image
Lucy Taylor  
Stereocaulon grande image
Stephen Sharnoff  
Stereocaulon grande image
Stephen Sharnoff  
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image
Stereocaulon grande image