Observation 188014: Stereocaulon condensatum Hoffm.

When: 2014-07-15

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

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

29% (1)
Recognized by sight
29% (1)
Used references: Jason Hollinger tentative ID
56% (1)
Used references: New York Botanical Garden

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Great! Thank you much.
By: Andrew Khitsun (Andrew)
2017-11-27 17:58:55 PST (-0800)

I see that Cheney collected it very close to this location – probably 30 miles or so as the bird flies.

Thanks, Andrew
By: Jason Hollinger (jason)
2017-11-27 17:37:05 PST (-0800)

You can search for your specimen here:


I put in “Khitsun 7152014-5” and it came back Stereocaulon condensatum. No notes or anything. Plausible name. I’d trust it.

I wanted to follow up on this one, since everyone was stumped by this guy.
By: Andrew Khitsun (Andrew)
2017-11-27 17:07:19 PST (-0800)
I just sent this specimen to James
By: Jason Hollinger (jason)
2016-01-31 19:58:48 PST (-0800)

At least I think it was this specimen… :)

I was, needless to say, completely stumped by it, even in with specimen in hand.

Jim was stumped with this one. He is still pondering the options
By: Andrew Khitsun (Andrew)
2016-01-31 19:01:31 PST (-0800)
Oh, I think I’ve got it!
By: Jason Hollinger (jason)
2014-11-28 00:42:13 PST (-0800)

Maybe it’s a Stereocaulon. Um. One of the crustose species, maybe? Oh phooey, I don’t know.

The only rock-dwelling isidiate gray species with K- and C- in Lendemer’s sterile crust key is Loxosporopsis corallifera… but it’s only known from the Pacific coast.

Maybe it’s some sort of weird form of a Pertusaria or Ochrolechia.

Just tried K on this.
By: Andrew Khitsun (Andrew)
2014-11-27 20:20:18 PST (-0800)

Surface of isidia is K+ very light green (I know there is officially no color result like this but that’s what it looks like to me). Medula changes color just a tad too. The most pronounced color – dark green – is where I cut through thallus, so the inner space of cortex where cut, however thin, stands out for its dark color against other parts of lichen.

Okay, don’t panic…
By: Jason Hollinger (jason)
2014-11-27 18:05:38 PST (-0800)

What about K? There are relatively few sterile isidiate crusts, we should be able to narrow this down quickly…

No response to C :-((
By: Andrew Khitsun (Andrew)
2014-11-27 17:58:11 PST (-0800)
I’m only slightly better off than you…
By: Jason Hollinger (jason)
2014-11-27 10:12:00 PST (-0800)

I know where to start guessing, at least! :) Try Ochrolechia yasudae… is it C+ red by any chance? (Would be extremely unsubtle if my guess is right.)

I don’t even know where to start guessing :-(
By: Andrew Khitsun (Andrew)
2014-11-10 22:26:00 PST (-0800)

Created: 2014-11-10 21:13:30 PST (-0800)
Last modified: 2018-01-28 16:24:17 PST (-0800)
Viewed: 87 times, last viewed: 2018-01-29 00:59:43 PST (-0800)
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