Observation 107086: Usnea lapponica Vainio

When: 2012-08-06

Collection location: Whitefish Dunes State Park, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

29% (1)
Recognized by sight
86% (1)
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Recognized by sight

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Aw, no fair
By: Jason Hollinger (jason)
2014-02-05 16:04:15 PST (-0800)

We didn’t stand a chance with a specimen like this with such poorly-developed soralia!! And on rock, too, wow, I’ve never seen this species on rock, cool.

Specimen identified by Jim Bennett
By: Andrew Khitsun (Andrew)
2013-12-29 09:40:19 PST (-0800)
That certainly rules out U. pensylvanica / U. rubicunda
By: Jason Hollinger (jason)
2012-08-26 20:28:26 PDT (-0700)

U. subfloridana can be K-. So can U. glabrata, but branches should be constricted at the points of attachment like sausage links, so it’s out. U. halei and U. subfusca are also K+ (norstictic and/or salazinic), so they’re out.

There are two photos of U. subfloridana in the New England Flora. This is from Clerc’s treatment in Sonoran Flora: shrubby; base black; branches not constricted; papillae few to many; fibrillose or not; soralia small and numerous near branch tips and slightly raised; isidia persistent even on old soralia; K± yellow UV± white (±thamnolic and/or ±squamatic acid).

Look for older specimens with clearly-developed soralia. Might help boost confidence in this “ruled everything else out” id.

By: Andrew Khitsun (Andrew)
2012-08-26 17:06:44 PDT (-0700)

So now I’m lost even more :-(

Almost always worth doing spot test for Usnea
By: Jason Hollinger (jason)
2012-08-26 13:11:04 PDT (-0700)

It’s a hard enough genus as it is, don’t throw away any potentially helpful clues! :)

U. pensylvanica isn’t always obviously reddish, especially in shade. It should have K+ yellow turning red medulla (stictic aggregate or norstictic + salazinic).

Of the bushy species in Thomson’s key with white medulla:

U. hirta – way more isidia
U. glabrata – ?
U. rubicunda = U. pensylvanica nowadays, I think
U. halei – also reddish at base, but usually (always?) on rock, otherwise plausible
U. subfusca – more “gnarly”, and conspicuously black at very base
U. subfloridana – ?
U. lapponica and U. glabrescens – large soralia

(I don’t know the two question mark species, so no comment.)

I’m struggling with ID
By: Andrew Khitsun (Andrew)
2012-08-26 12:40:21 PDT (-0700)

I’ve lost the trail somewhere half-way down Thomson’s keys for Usnea. These lichen have slight reddening at the very base of each specimen – that’s why I thought of U. pensylvanica name.

Created: 2012-08-26 12:35:54 PDT (-0700)
Last modified: 2013-12-29 09:39:48 PST (-0800)
Viewed: 38 times, last viewed: 2017-06-13 20:30:02 PDT (-0700)
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