Observation 49784: Psora decipiens (Hedwig) Hoffm.
When: 2010-07-21
No herbarium specimen

Notes: Location: 52°10’55.53"N, 117° 6’15.29"W, el. 2265m

Identification: Squamulose lichen with reddish-brown squamules, upturned whitish margins, whitish pruina, and abundant, black, marginal apothecia.

Habitat: abundant on damp mud near the edge of a retreating large snow patch in the alpine zone.

[admin – Sat Aug 14 02:04:27 +0000 2010]: Changed location name from ‘Parker Ridge, Banff NP, Alberta, Canada’ to ‘Parker Ridge, Banff National Park, Alberta, Canada’

Proposed Names

46% (2)
Eye3 Eyes3
Used references: Brodo, Sharnoff, and Sharnoff, 2001, pp.597-604; Hinds and Hinds, 2007, pp.423-425

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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good point
By: Jason Hollinger (jason)
2010-08-07 02:05:46 BST (+0100)

P. himalayana should be green when wet, I didn’t think of that. And yes, my specimens of himalayana are more clearly singled, as you say. I’m almost convinced. :)

shingled squamules
By: Chris Parrish (kitparrish)
2010-08-07 01:23:00 BST (+0100)

The squamules in Sharnoff’s photos of Psora himalayana are shingled, but the squamules in Sharnoff’s photos of Psora decipiens seem to be thrown about more haphazardly as in these photos. Brodo calls the squamules of Psora decipiens “regularly shingle-like.” Also, the mud was damp near the snow, but the squamules I noticed were all reddish-brown and white, not green as in one of Sharnoff’s photos of himalayana. Does that seem to indicate decipiens?

Try Psora himalayana, too
By: Jason Hollinger (jason)
2010-08-07 00:28:35 BST (+0100)

I’m still on the fence: not pink enough for decipiens, but too pruinose for himalayana; no apothecia clearly laminal, but none of the tiny black marginal spots I’m used to seeing on decipiens; I’m also used to seeing decipiens on soil, not decayed plant matter. Tough one!

Created: 2010-08-07 00:00:51 BST (+0100)
Last modified: 2010-08-14 04:25:16 BST (+0100)
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