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Cetraria laevigata Rass.  
Family: Parmeliaceae
Cetraria laevigata image
Stephen Sharnoff
  • American Arctic Lichens
  • Resources
Thompson, J., 1984. American Arctic Lichens: The Macrolichens.
Thallus fruticose, erect, to 11 cm tall, the lobes 2-10 mm broad; irregularly branched, somewhat sympodial, the branches inrolled and canaliculate as in C. ericetorum and C. islandica, the tips slightly reflexed; upper side pale brown; underside paler, the base very pale pinkish but not red; the whole giving a much paler looking plant than the previous two species; underside with marginal pseudocyphellae which are wider and more continuous than in C. ericetorum. Cortex prosoplectenchymatous, 40-75 μ thick; medulla loose, to 260 μ thick. Apothecia not seen.

Reactions: K + yellow to red, KC + yellow to red, P+ red.

Contents: fumarprotocetraric acid.

Growing in moister habitats than the previous two species, it is possibly a broad-ranging amphi-Beringian arctic species, in North America ranging from Alaska eastward through upper Canada. In Europe it extends only into the European USSR.

Cetraria laevigata
Open Interactive Map
Cetraria laevigata image
Stephen Sharnoff
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Stephen Sharnoff
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Stephen Sharnoff
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Stephen Sharnoff
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Lucy Taylor
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394
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