Observation 204892: Tephromela atra (Hudson) Hafellner

When: 2015-05-13

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

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

29% (1)
Recognized by sight
67% (2)
Eye3 Eyes3
Based on microscopic features: Red-purple hymenium and simple ellipsoid spores, lecanorine exciple
Based on chemical features: K+y

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
yellow pruina?
By: Jim Bennett (Lichenman)
2017-02-15 11:21:49 CST (-0500)

Am working on this specimen now and there are yellow crystals on both the disks and the thallus. Very odd.

Keep in mind…
By: Jason Hollinger (jason)
2015-05-24 15:40:57 CDT (-0400)

that the black prothallus in that one photo may have more to do with the species it’s interacting with. If it were intrinsic to this species then you would normally see it around all thalli, especially ones growing on bare stone without any competition.

You posted another like this recently — a Lecanora like crust with black apothecia. I’m hoping you’ve got a Tephromela atra in one of these! But there are black-eyed Lecanora, too…

Thallus looks somewhat like observation 204765
By: Andrew Khitsun (Andrew)
2015-05-24 14:33:55 CDT (-0400)

It’s more bumpy, but the surface structures look similar. The other concern is a black prothallus (seen in bottom picture) versus white prothallus in observation 204765

Created: 2015-05-24 14:15:10 CDT (-0400)
Last modified: 2017-03-22 20:33:24 CDT (-0400)
Viewed: 49 times, last viewed: 2017-06-20 04:39:24 CDT (-0400)
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