Observation 107744: Cetrelia olivetorum (Nyl.) Culb. & C. Culb.

When: 2012-08-06

Collection location: Whitefish Dunes State Park, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

18% (2)
Recognized by sight
-28% (1)
Recognized by sight: Large white spots on greenish ruffled Parmotrema-like thallus.
86% (1)
Eye3 Eyes3
Recognized by sight
Used references: ID confirmed by Jason Hollinger

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks for posting these corrections!
By: Jason Hollinger (jason)
2014-02-05 19:00:40 EST (-0500)
Specimen identified by Jim Bennett
By: Andrew Khitsun (Andrew)
2013-12-29 09:51:19 EST (-0500)
I’d love it to be Cetrelia chicitae
By: Andrew Khitsun (Andrew)
2012-08-30 21:27:14 EDT (-0400)

Since I’ve never seen it before and was actually looking for it. Unfortunately, I don’t see any fluorescence on medula, either with a naked eye or under the microscope. C test came negative (C-). KC test on medula was KC+ red, on soredia KC+ wine-red, quickly disappearing.

Well, phooey on the UV light!
By: Jason Hollinger (jason)
2012-08-30 14:50:28 EDT (-0400)

This is Cetrelia, so it should be strongly UV+ regardless which species. I don’t know what to say, the one I got worked really well. Sorry!

Did you do a C test? The white spots look large enough that I would guess it is C. chicitae, but it’s always worth doing the test to be sure.

Can’t ID
By: Andrew Khitsun (Andrew)
2012-08-29 21:58:39 EDT (-0400)

I have bad luck with Parmotrema. This one is medula K-, KC+, UV-. Thallus sorediate, K-. Lower surface appears to be white, at least at the tips (can’t separate from the substrate in the middle), with white rhizines. Wait – I take it back. There was an infiltrator over which this lichen grew – they all are just trying to confuse me. OK – black lower surface with prominent white tips.

Created: 2012-08-29 21:52:08 EDT (-0400)
Last modified: 2015-12-18 23:18:55 EST (-0500)
Viewed: 164 times, last viewed: 2017-06-14 00:18:58 EDT (-0400)
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