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arctoparmelia lichen
Scientific Name: Arctoparmelia centrifuga
Family: Parmeliaceae
Category: Lichen
Growth: Lichenous
Duration:
Other Names:
Arctoparmelia
Arctoparmelia is a genus of lichens belonging to the family Parmeliaceae.
Taxonomy and Nomenclature
- Scientific Name: Arctoparmelia Hale, 1986
- Family: Parmeliaceae
- Synonyms:
- Arctoparmelia aleuritica (Nyl.) Hale
- Parmelia aleuritica Nyl.
- Parmelia centrifuga (L.) Ach.
- Xanthoparmelia centrifuga (L.)
Common Species
- Arctoparmelia centrifuga (L.) Hale, also known as Concentric-ring Lichen or Ripple Ring Lichen.
- Arctoparmelia incurva (Pers.) Hale
- Arctoparmelia separata
- Arctoparmelia subcentrifuga
Distribution and Habitat
- Found in North America, including Alaska, Newfoundland, and Quebec, Canada.
- Also found in Europe, including Sweden.
- Grows on rocks (saxicolous) and exposed bedrock in environments subject to desiccation stress and intense light levels.
- Often found in taiga forests, particularly on boulders in Scotch pine forests.
- Observed in locations such as the Annieopsquotch Mountains, Kangerlussuaq area in West Greenland, Inglefield Land, and Yellowknife, Northwest Territories.
Morphology and Growth Habits
- Thallus is foliose, closely adnate to the substratum.
- Commonly dies in the center, forming concentric rings with a radial growth pattern.
- Lobes are irregularly branching with pointed, flat tips.
- Color ranges from yellow to yellow-grey.
- Lobes are narrow, crowded, and radiating, often convex in cross-section and turned under at the tips.
- Pale brown underside.
Ecological Role
- Forms symbiotic relationships as a lichen.
- Its presence may be decreasing in certain areas (e.g., Sweden) due to the decline of specific substrates like dead pines and unpainted hay barns.
Interactions with Other Organisms
- Can be found growing alongside other lichens such as Rhizocarpon sp.
Quirky Facts
- Arctoparmelia centrifuga exhibits a radial growth pattern where the interior dies back and becomes recolonized, creating its characteristic concentric rings.
- Usnic acid-deficient thalli have been observed in European populations of Arctoparmelia centrifuga.
Further Information
- Refer to "Lichens of North America" by Brodo, I.M., Sharnoff, S.D. and Sharnoff, S. (2001), specifically pages 162-163, published by Yale University Press.