Observation 168235: Physcia aipolia (Ehrh. ex Humb.) Fürnr.

When: 2014-06-23

Collection location: Hunlock Creek, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

No specimen available

Proposed Names

3% (2)
Recognized by sight: Photos taken indoors.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: Jason Hollinger (jason)
2015-04-13 12:39:01 PDT (-0700)

Looking back now, it’s much more likely this was one of those specimens where the K+y test is not very obvious. Until proven otherwise, I’m going to lean toward Physcia again…

smooth apothecia
By: Vitaly Charny (vcharny)
2015-04-13 12:15:16 PDT (-0700)

Just for consideration… all Anaptychias I’ve found were in locations that often have wet conditions – on large trees trunk bases. Occasionally I found them on big mossy rocks. Physcia prefer tree branches on partly sunny locations. Also I do not remember Anaptychia with smooth apothecia rim what Physcias have. Anapthychia have their apothecias lobulated.

The green…
By: Dave W (Dave W)
2014-06-26 04:53:59 PDT (-0700)

did indeed become more vivid.

That really does sound like Anaptychia palmulata
By: Jason Hollinger (jason)
2014-06-26 00:45:14 PDT (-0700)

It really turns striking green when moistened. Just an odd place to find it. But must be possible.

Found growing on a branch…
By: Dave W (Dave W)
2014-06-25 19:08:45 PDT (-0700)

about 4 feet above ground level (apple tree).

KOH applied to the lichen did not cause a yellow reaction. The green color of the lichen merely became more evident, probably on account of being moistened.

Where did you find this?
By: Jason Hollinger (jason)
2014-06-23 20:52:23 PDT (-0700)

Had never considered how similar Anaptychia palmulata and Physcia aipolia might look because they grow in very different habitats: the former on the base of trees, the latter in the canopy on twigs and branches.

K test on the cortex is the definitive character: Anaptychia lacks atranorin, is therefore browner, and lacks the K+ yellow reaction of Physcia. (Also Anaptychia lacks P. aipolia’s conspicuous white mottling.)

Created: 2014-06-23 18:21:37 PDT (-0700)
Last modified: 2015-04-13 12:38:05 PDT (-0700)
Viewed: 55 times, last viewed: 2017-06-18 06:40:12 PDT (-0700)
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