Observation 32667: Peltigera membranacea (Ach.) Nyl.
When: 2010-01-24
Who: BakerSt10
No herbarium specimen

Images

75366
75367
75368
75507
My original photo’s of the underside were blurry so I took some more
75508
My original photo’s of the underside were blurry so I took some more

Proposed Names

-91% (2)
Recognized by sight: Growing on Rocky road cut White on other side
18% (3)
Recognized by sight
47% (2)
Recognized by sight
77% (2)
Eye3 Eyes3
Used references: Jason’s MO references

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Try scratching the surface…
By: Jason Hollinger (jason)
2010-01-31 21:09:55 CST (-0500)

If you want to remove any doubt that this is an unusual “mushroom” :), take a look at the internal structure. You’ll see a distinct blackish-greenish layer just under the upper surface — this is the cyanobacteria. Foliose and fruticose lichens form far and away the most complex vegetative structures of any fungi.

Underside
By: BakerSt10
2010-01-25 15:15:25 CST (-0500)

I added pictures. Thanks for the info. I still am surprised this is considered a lichen

By: Jason Hollinger (jason)
2010-01-25 11:41:10 CST (-0500)

Hard to tell if it’s tomentose near the margins or not since it’s wet. It looks like P. neopolydactyla but it would be unusual as far as I know to see it growing on a bare tree trunk like that. Both P. membranacea and P. praetextata could be expected in such a place, but both of those should be at least thinly tomentose near the growing margins. I’d guess P. membranacea in absence of any other information.

(The Cladonia all around it might be C. squamosa, by the way.)

Mushroom body
By: BakerSt10
2010-01-24 17:41:59 CST (-0500)

I don’t think the mushroom body part is a lichen

Created: 2010-01-24 16:31:29 CST (-0500)
Last modified: 2010-04-21 10:03:12 CDT (-0400)
Viewed: 50 times, last viewed: 2016-10-26 16:06:14 CDT (-0400)
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