Observation 90986: Parmotrema perlatum (Hudson) M. Choisy

When: 2012-03-26

Collection location: Bon Tempe Reservoir, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

I made an attempt to pin these down but got as far as a possible Cladonia species.
They were growing on a log in an area of mostly Live oak, Madrones and some Doug firs.
Part of the Lichen made small chalices with brown interiors and whitish to greenish exteriors. Eventually the cups open to form brown petals.
I suspect these are common but I need help from the Lichen Folk.

Proposed Names

18% (2)
Recognized by sight
56% (1)
Recognized by sight: ruffled gray foliose thallus, lip-shaped marginal soralia, short cilia

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
K + on the medulla did turn yellow.
By: Ron Pastorino (Ronpast)
2012-03-28 05:34:30 CST (+0800)

Thanks Jason.

No wonder you had trouble with this
By: Jason Hollinger (jason)
2012-03-27 08:29:44 CST (+0800)

This is a Parmotrema perlatum (= P. chinense) or P. arnoldii that’s gone crazy-fertile. I don’t see any other options — there are marginal soralia clearly on the same lobes as apothecia. I’ve never seen this fertile before, let alone this abundantly fertile! Remarkable specimen.

Cilia seem too short for P. arnoldii, but K test on medulla would be good to verify. P. perlatum should be K+ yellow or orange, P. arnoldii K- (but careful not to get the cortex which is K+ yellow for both).

Created: 2012-03-27 08:19:52 CST (+0800)
Last modified: 2012-03-27 08:32:40 CST (+0800)
Viewed: 82 times, last viewed: 2018-01-08 13:22:40 CST (+0800)
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