Observation 114741: Peltigera rufescens (Weiss) Humb.
When: 2012-09-01
Herbarium specimen reported

Proposed Names

61% (2)
Eye3 Eyes3
Used references: ID confirmed by Jason Hollinger

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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ID confirmed by Jim Bennett
By: Andrew Khitsun (Andrew)
2014-06-24 00:13:24 CDT (-0400)
Aha! I’m convinced that’s a useful observation!
By: Jason Hollinger (jason)
2012-10-29 21:10:44 CDT (-0400)

Yes, I see these things from time to time, too, the ones that are absolutely impossible to clean off. They’re always in the driest habitats. I think P. ponojensis with its relatively discrete rhizines can’t do this; only the woolly mat of rhizines of P. rufescens can cling so tenaciously to the soil and debris. I think we should go with that name despite the apparently white underside. I think P. ponojensis shouldn’t even have dark rhizines, by the way. But these two species kick my butt still…

Just picked some pieces apart.
By: Andrew Khitsun (Andrew)
2012-10-29 20:43:15 CDT (-0400)

I feel like forensic expert. It seems thallus keeps its white color even towards the center. Rhizines become darker, though. Rhizines are of two types: some are longer, cord-like, and some are shorter tufts. They don’t seem to merge into one another, for the most part.

Can’t say for sure.
By: Andrew Khitsun (Andrew)
2012-10-29 20:31:16 CDT (-0400)

It’s devilishly hard to separate thallus from substrate, so I can’t see if the veins are darker towards the middle. And looking at photos in Brodo, there isn’t that much difference anyway. Rhizines are white tufts, pretty discreet – but again on the lobe tips: I can’t tell what’s deeper inwards at this point.

I think you’re right
By: Jason Hollinger (jason)
2012-10-29 01:21:46 CDT (-0400)

I have trouble distinguishing P. rufescens from P. ponojensis, though, without seeing the rhizines and veins. P. ponojensis has pale veins and ~discrete rhizines. _P. rufescens has a more matted rhizines and its veins turn dark toward the center.

Looks unusual
By: Andrew Khitsun (Andrew)
2012-10-28 19:59:48 CDT (-0400)

Growing on a dry forest hill, it attracted my attention from afar, since I wasn’t sure what I was looking at. Upon closer inspection, I realised it was Peltigera, intertwining with mosses in a peculiar way.

Created: 2012-10-28 19:53:58 CDT (-0400)
Last modified: 2015-12-20 21:46:13 CST (-0500)
Viewed: 41 times, last viewed: 2015-12-21 02:04:38 CST (-0500)
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