Observation 87128: Lecanora muralis (Schreber) Rabenh.

When: 2012-01-28

Collection location: Stebbins Cold Canyon Reserve, Solano Co., California, USA [Click for map]

Who: Byrain

No specimen available

Notes:
Growing on an exposed rock embedded into the middle of the trail, I tried a K test with a Q-tip and appear to have gotten a faint K+yellow.

Was found next to obs 87201 and is probably the same as that.

Images

197381
197382

Proposed Names

28% (1)
Recognized by sight
31% (2)
Eyes3
Recognized by sight: almost foliose flat marginal lobes, but clearly crustose in interior

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Sure
By: Jason Hollinger (jason)
2012-01-29 11:32:50 PST (-0800)

All the usnic acid species should give a nice KC+ golden reaction on the cortex: Flavoparmelia, Flavopunctelia, Xanthoparmelia, Usnea, Ramalina.

Many of the gray foliose species should have atranorin and be K+y on the cortex: Physcia, Punctelia, Parmotrema, Hypogymnia (but not Physconia or Phaeophyscia)

C+ red is a bit trickier. Parmelina coleae (= P. quercina), Melanelixia glabra (=Melanelia glabra), Flavopunctelia all have lecanoric acid in the medulla, giving a vivid dark C+ red. Most Umbilicaria (e.g., U. phaea) should have gyrophoric acid (C+ pink) in the medulla.

The only good CK+ test I know is diffractaic acid, which can be most reliably found in Usnea ceratina, but that might not be easy to find.

A more subtle test for KC+ would be the medulla of Flavoparmelia. It has protocetraric acid in relatively small concentrations. It’s typically a very difficult test to get right, in my experience. If you can get a good KC+ pink/rose off of Flavoparmelia caperata using a Q-tip, I would be very excited!

Forgot to mention
By: Byrain
2012-01-29 11:12:17 PST (-0800)

That this also appeared to be C- and do you examples of something I may (Have?) found in my area with a vivid KC+/CK+ reaction I can use to play around with the q-tip test?

Good test
By: Jason Hollinger (jason)
2012-01-29 10:56:44 PST (-0800)

Definitely need to play with the Q-tip test myself, too. I would’ve called this Lecanora muralis but that should be KC+ yellow not K+ yellow.

Created: 2012-01-28 21:25:51 PST (-0800)
Last modified: 2012-01-30 00:02:36 PST (-0800)
Viewed: 51 times, last viewed: 2017-06-10 06:33:27 PDT (-0700)
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