Observation 210818: Physcia phaea (Tuck.) J.W. Thomson

When: 2015-07-10

Collection location: Petenwell Rock, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

92% (2)
Eye3 Eyes3
Recognized by sight: rugose upper surface
Based on microscopic features: lower cortex prosoplectenchymatous throughout, spores clearly physcia-type, ~18-20(22)x7-8(9)µm
Based on chemical features: cortex K+y, medulla K+y

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Jim Bennett returned ID P.phaea too,
By: Andrew Khitsun (Andrew)
2016-01-20 19:15:40 CST (-0600)

putting in the notes that “few apothecia are pruinose”.

Not another one of those identity-challenged Physcia aipolia populations!
By: Jason Hollinger (jason)
2015-07-20 20:18:06 CDT (-0500)
Just to add fuel to a debate about P.aipolia versus P.phaea
By: Andrew Khitsun (Andrew)
2015-07-20 20:17:24 CDT (-0500)

This one is on sandstone. As can be seen in photos, some of the apothecia are pruinose. Also, there are two color variations, with greenish being “normal”, and brownish color due to some weird stuff going on on top of thallus. Perhaps this one is P.aipolia after all. However, please compare with the last photograph. I believe that one is a “classic” P.phaea. I know visual characteristic don’t play much role in lichen ID and are deceiving, but I see P.phaea as more appressed, tending to form perfect round thalli with very “smooth” edge, and having some much bigger apothecia in the middle.

Created: 2015-07-20 19:33:32 CDT (-0500)
Last modified: 2016-01-20 19:14:36 CST (-0600)
Viewed: 38 times, last viewed: 2017-06-20 10:45:32 CDT (-0500)
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