When: 2008-10-23

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

Who: Paul Derbyshire (Twizzler)

No specimen available

Found on several birch trees along with Xanthomendoza hasseana (obs. 13059).

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 third photo.

Edit, June 11 2009: Checked on these again and they seem faded. Did take a new shot of the apothecia. Also, the tree is not birch, it is quaking aspen.


Proposed Names

17% (2)
Recognized by sight
28% (1)
Recognized by sight: don’t see any maculae
85% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
I’m giving lichens lots of names, not sure if they’re good, though… :)
By: Jason Hollinger (jason)
2008-10-24 15:26:34 CDT (-0400)

Actually, you might have both here. According to Brodo, there are only two choices for fertile Physcia growing on birch:

P. stellaris: medulla K-, surface smooth and even (not white-spotted except in old thalli or in the center of old thalli), apothecia often white-pruinose (but not thallus)

P. aipolia: medulla K+ yellow (zeorin and atranorin), surface conspicuously white-spotted or -mottled, apothecia gen. heavily white-pruinose (but not thallus)

The thumbnail sure looks unmottled, but photo number two does look mottled all over. Both are apparently common in your area. (I think P. aipolia has experienced some recent taxonomic growing pains, too, but I forget where I read about that…)

By: Paul Derbyshire (Twizzler)
2008-10-24 12:24:56 CDT (-0400)
lovely thumbnail. you and jason are giving lichens a good name!
By: Debbie Viess (amanitarita)
2008-10-24 11:30:02 CDT (-0400)