Observation 113612: Rhizocarpon Ramond ex DC.

When: 2012-08-16

Collection location: Governor Dodge State Park, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available

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Rock is out of the question
By: Andrew Khitsun (Andrew)
2012-10-17 20:29:31 CDT (-0500)

I only have scraped some thallus and don’t have any rocky substrate in the mix. The other options are possible – this whole thing is way above my pay level.

Not sure how to interpret that, either
By: Jason Hollinger (jason)
2012-10-17 01:16:25 CDT (-0500)

Definitely sounds like R. grande is out, though. (Shoot, it really looked like it, too!) I wonder if you’re seeing the dark rock come through because the KOH is dissolving the thallus, or if you’re seeing something like fumarprotocetraric acid (not mentioned for any of the species in the Thomson keys at least), or if you’re seeing the bright red of norstictic acid but it’s being confounded by the dark algal layer coming through? Darn, I had such hopes for this one…

My color perception is very poor.
By: Andrew Khitsun (Andrew)
2012-10-16 21:28:31 CDT (-0500)

Unless colors are bright and flashy. Now that the test spot is dry, it doens’t seem purplish anymore, but probably can be called very dark yellow to brownish.

It seems K+
By: Andrew Khitsun (Andrew)
2012-10-16 21:16:22 CDT (-0500)

K leaves permanent darkening on thallus, which looks a bit purplish, but I could be mistaken about that. K- on medula. C-

I think R. grande and R. eupetraeum are most likely
By: Jason Hollinger (jason)
2012-10-16 18:29:50 CDT (-0500)

Spot test might actually do the trick, believe it or not. Do a careful C test, only R. grande is C+ pink/red. K+ yellow-red could be R. cinereovirens or R. eupetraeum (hmm, and apparently R. disporum sometimes). K- C-… well then we need spores.

Bottom photo shows the general environment.
By: Andrew Khitsun (Andrew)
2012-10-16 18:22:36 CDT (-0500)

But the lichen grow towards the bottom of those bluffs, in shady environment.

Created: 2012-10-16 18:05:56 CDT (-0500)
Last modified: 2012-10-16 18:08:57 CDT (-0500)
Viewed: 38 times, last viewed: 2017-06-14 06:15:21 CDT (-0500)
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