Observation 221245: Parmotrema perlatum (Hudson) M. Choisy

When: 2015-10-13

Collection location: San Simeon, California, USA [Click for map]

35.628° -121.0846° 203m

Who: J-Dar

Specimen available

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

92% (2)
Eye3 Eyes3
Recognized by sight: New name for P. chinense

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Yes, Esslinger List says perlatum is the correct name now
By: Jason Hollinger (jason)
2015-11-05 05:22:22 NZDT (+1300)

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

Deprecate P. chinense?
By: J-Dar
2015-11-05 02:20:51 NZDT (+1300)

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

Definitely not P. stuppeum
By: Jason Hollinger (jason)
2015-11-01 07:47:15 NZDT (+1300)

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: 2015-11-01 07:28:44 NZDT (+1300)
Last modified: 2015-11-05 17:17:01 NZDT (+1300)
Viewed: 35 times, last viewed: 2017-06-21 18:55:55 NZST (+1200)
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