Observation 110251: Lobaria quercizans Michaux

When: 2012-03-04

Collection location: Chubb Trail, Eureka, Missouri, USA [Click for map]

Who: Patrick Harvey (pg_harvey)

No specimen available

Proposed Names

17% (2)
Recognized by sight
56% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I’m pretty sure there is no other choice…
By: Jason Hollinger (jason)
2012-09-18 00:12:17 MST (-0700)

…but wow, this is a very rare find (apparently) in that part of the country. I can only find one other record from the Ozarks a little south of you in Arkansas. It’s not covered by the Ozarks flora, or Brodo’s distribution maps in Lichens of North America, or in the North American monograph on the genus.

There is a small chance that it is Punctelia bolliana with such inconspicuous pseudocyphellae that we can’t see them in the photo(?) But if you ever happen to go back and remember to grab a scrap of it, do a K test on the medulla. That will verify it easily: L. quercizans has a K+ yellow-orange reaction (unknown chemistry) which is unique among similar-looking parmelioid lichens. (Also, the underside will have tomentum, but you might have to look really close, I’ve been fooled before with just a casual glance.)

Created: 2012-09-17 20:01:35 MST (-0700)
Last modified: 2012-09-18 00:00:37 MST (-0700)
Viewed: 24 times, last viewed: 2017-06-14 00:31:00 MST (-0700)
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