Mountain Oakmoss Lichen - Evernia divaricata
State Rank Reason (see State Rank above)
Populations have a very spotty distribution in Montana.
Thallus fruticose and pendulous to 30 cm long (lowland variant) or prostrate to 5 cm long (alpine variant). Thallus cream-yellow when fresh, turning reddish-brown in the herbarium; cortex frequently broken, exposing the medulla; medulla loose (lowland variant) or fairly dense (alpine variant); apothecia rare (lowland variant) or lacking (alpine variant) McCune and Geiser 2009
. Chemistry: Cortex KC+ yellow; Medulla UV+ blue-white McCune and Geiser 2009
Alpine Variant: Arctic-alpine south through the Rocky Mountains to Arizona and New Mexico (McCune and Geiser 2009). Lowland Variant: Rocky Mountains of British Columbia and Alberta south to New Mexico and Arizona (McCune and Geiser 2009).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
On trees in moist coniferous forests (lowland variant) or on alpine sod (alpine variant).
Both the alpine and lowland variants have been found in Montana.
Fragmentation (?) and occasionally by spores from apothecia (lowland variant).
Threats or Limiting Factors
This lichen is a dispersal limited species.