Observation 221245: Parmotrema perlatum (Hudson) M. Choisy
When: 2015-10-13
(35.628° -121.0846° 203m)
Who: J-Dar

Notes: Live oak woodland habitat along Van Gordon Creek. Substrate is Coast Live Oak tree (Quercus agrifolia) bark.

Thallus grey, lobes large, undulating, with soredia on margins, cilia >1mm. Underside black centrally with dense simple black rhizines, uniformly brown periphally at lobes. Upper cortex K+Y, C-, KC-. Medulla K+Y (barely turning orangish), C-, KC-.

Parmotrema stuppeum specimens are also reported for the vicinity, but this species should have medulla K+Y turning deep red with Salazinic Acid, instead of orange with Stictic Acid.

Proposed Names

91% (2)
Eye3 Eyes3
Recognized by sight: New name for P. chinense

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Yes, Esslinger List says perlatum is the correct name now
By: Jason Hollinger (jason)
2015-11-04 17:22:22 CET (+0100)

Don’t know the details, but it seems widely accepted. Thanks for cleaning that up.

Deprecate P. chinense?
By: J-Dar
2015-11-04 14:20:51 CET (+0100)

In favor of P. perlatum? Wasn’t sure if both names were listed for a reason.

Definitely not P. stuppeum
By: Jason Hollinger (jason)
2015-10-31 19:47:15 CET (+0100)

That species has distinctive long, narrow, linear, marginal soralia. Your specimen has the short, pillowy, marginal soralia typical of P. chinense (and P. arnoldii). Also, P. stuppeum always has a very strong salazinic reaction in my experience, not mistakable for stictic acid. (But I’m sure someone will prove me wrong momentarily, ha!)

Created: 2015-10-31 19:28:44 CET (+0100)
Last modified: 2015-11-05 05:17:01 CET (+0100)
Viewed: 33 times, last viewed: 2016-10-27 09:57:46 CEST (+0200)
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