Observation 74971: Physcia (Schreb.) Michaux

When: 2011-08-30

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

45.806696° -77.138456°

Who: Paul Derbyshire (Twizzler)

No specimen available

Surrounding the Xanthomendoza hasseana on this small branch of an aspen in Zone 14.



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On the white cottony inner layer
By: Jason Hollinger (jason)
2011-08-31 00:34:35 CDT (-0500)

P. aipolia produces atranorin in the medulla, incidentally the same thing that gives the outer surface the distinctive pale grayish color, a useful pigment for lichens exposed to the sun, since it blocks UV. Not sure what good it does the lichen in the interior, though. Various theories, but little convincing evidence.

On the surface of what, the apothecia?
By: Paul Derbyshire (Twizzler)
2011-08-31 00:25:48 CDT (-0500)

Of course, my lack of reagents or ready access to them renders the question moot.

By: Jason Hollinger (jason)
2011-08-30 23:55:22 CDT (-0500)

Supposedly presence of white mottling on the surface makes it P. aipolia, but confirm with K test on medulla (aipolia is K+y, stellaris K-). I’ve seen plenty of mottled specimens with K- medulla, so I’m skeptical…

Created: 2011-08-30 21:46:10 CDT (-0500)
Last modified: 2011-08-30 21:46:21 CDT (-0500)
Viewed: 44 times, last viewed: 2017-06-09 20:03:41 CDT (-0500)
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