Page author: Crow Vecchio
Parmotrema arnoldii

Distribution: West of Cascades crest in Washington; northern British Columbia to lower California, disjuncts in Minnesota, Wisconsin, Maine, Vermont, New Hampshire, Virginia, North Carolina, South Carolina, Georgia.

Habitat: Open forest.

Substrate: On bark of all kinds, and occasionally on rock.

Conservation Status: Not of concern


Thallus pale grey, lobes somewhat divided, 6-15 mm in width. Abundant long cilia. Lower surface brown to black with wide naked margin.

Accepted Name:
Parmotrema arnoldii (Du Rietz) Hale

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Parmotrema arnoldii in the Consortium of Pacific Northwest Herbaria database.

CalPhotos: Parmotrema arnoldii photos.

USDA Plants: Parmotrema arnoldii information.

3 photographs:
Group by