Observation 98523: Lichen P. Micheli

When: 2012-06-27

Collection location: Apple Park Apartments, Olympia, Thurston Co., Washington, USA [Click for map]

Who: Drew Henderson (Hendre17)

No specimen available

Crustose lichen found on Acer macrophyllum and Prunus. Bright white thallus-spreading.

Temp: Low 70’s, sunny.

Used Brodo/Sharnoff- can’t seem to key this one out. Need Jason’s advice on this for sure!



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These things are definitely a challenge!
By: Jason Hollinger (jason)
2012-06-28 03:33:30 CDT (-0400)

But remarkably, with “just” these four chemical spot tests, you can often get pretty close. I suspect Ochrolechia, but for me it’s purest guesswork without a positive C test. If I’m right, it should be C+ and KC+ pink or red. It helps to scratch it first to make sure you’re testing both the cortex and the medulla. One or two species also contain lichexanthone, which would be UV+, too.

By: Drew Henderson (Hendre17)
2012-06-28 02:55:10 CDT (-0400)

That’s a Bummer :(

I will go take a look tomorrow and try what you aforementioned… Thought maybe you’d have a “aha” and just let me know the spp to start with. Brodo and other keys were useless. This is definitely a challenge! Thanks for your continued help Jason- hope you are well,



Can’t help this time!
By: Jason Hollinger (jason)
2012-06-28 02:33:24 CDT (-0400)

First step with unknown sterile crusts like this is to do the best you can with chemistry. K (KOH) and C (bleach) at very least, PPD and UV (350nm) if you have them. You might also verify under the microscope that the alga is Trebouxioid and not Trentepohlioid. (Good luck! :) Once you have that, then get a copy of J. Lendemer’s preliminary keys to the crustose lichens of North America, and keep your fingers crossed…

Created: 2012-06-27 23:51:39 CDT (-0400)
Last modified: 2012-06-27 23:52:09 CDT (-0400)
Viewed: 30 times, last viewed: 2017-06-13 05:25:25 CDT (-0400)
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