When: 2008-10-23

Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]

Who: Paul Derbyshire (Twizzler)

No specimen available

Notes: Found on several birch trees along with another lichen species (obs. 13058).

The trees were at the north edge of a stand of mixed birch and jack pine. Birch elsewhere in the area, including with eastern or southern exposures, tended to lack these lichen encrustations.

The juxtaposition of similar-morphology yellow and blue lichens is striking, particularly in the first photo.


Proposed Names

57% (1)
Used references: Jason Hollinger, in a discussion connected with obs. 12704. One of the two trees here is the tree from 12704, so the yellow lichen is almost certainly the same species in both that observation and this.

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= Observer’s choice
= Current consensus


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