Observation 215585: Parmotrema perlatum (Hudson) M. Choisy

When: 2015-08-28

Collection location: Gualala, California, USA [Click for map]

38.7651° -123.5186° 38m

Who: J-Dar

Specimen available

Collected from redwood forest on trails near the Performing Arts Center off Old State Highway and Gualala Road.

2 specimens collected from the ground, on twigs of either redwood or pine.

Thallus grey above, black below except for uniformly brown lobe tips (see photo), with long black cilia up to 2mm on lobe margins. Soredia marginal. Need to confirm chemistry. [EDIT: See comment.]

Growing with Hypogymnia tubulosa (observation 215578) and Usnea sp.


Thallus underside uniformly brown at lobe tips

Proposed Names

76% (2)
Eye3 Eyes3
Based on chemical features: Medulla K+Y turning orangish

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: J-Dar
2015-09-14 06:48:17 AEST (+1000)

Thallus upper cortex K+Y immediately, C-, KC- (stays yellow from initial K+ reaction).

Medulla K+Y, with a slow and slight change to orangish over several minutes. C-, KC-.

Also, thallus underside uniformly brown on lobe tips.

P. arnoldii should have K- medulla and different color on underside of lobes.

Created: 2015-09-08 03:17:46 AEST (+1000)
Last modified: 2015-11-05 08:22:33 AEDT (+1100)
Viewed: 29 times, last viewed: 2017-06-21 10:32:53 AEST (+1000)
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