Observation 92280: Arthothelium norvegicum Coppins & Tønsberg

When: 2012-04-08

Collection location: Pine Hollow State Natural Area, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available


Copyright © 2012 Jason Hollinger (jason)
Copyright © 2012 Jason Hollinger (jason)
Copyright © 2012 Jason Hollinger (jason)
Copyright © 2012 Jason Hollinger (jason)
Copyright © 2015 Jason Hollinger (jason)
Copyright © 2015 Jason Hollinger (jason)

Proposed Names

6% (2)
Recognized by sight
79% (3)
Eye3 Eyes3
Used references: British Flora p 178 (Smith et al)
Based on microscopic features: muriform spores 32×13, identical in both white & green thalli
Based on chemical features: epithecium K+ green

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Added some close-ups and micrographs
By: Jason Hollinger (jason)
2015-12-16 14:39:30 CST (-0500)
Very unusual find
By: Jim Bennett (Lichenman)
2014-09-12 12:28:13 CDT (-0400)

Coppins questions the existence of this species in NA, but there is one record from Texas from 1950, but I haven’t seen the specimen. It fits the description in the British flora, but should be checked. What is odd is 2 different thalli on the same substrate but both have the exact same spores. The host species is unidentified but it is smooth and appears to be a hardwood, perhaps Acer.

Multiple strains of fungus in same thallus?
By: Jason Hollinger (jason)
2012-04-09 21:34:56 CDT (-0400)

Just coincidence? If these things weren’t so blasted difficult to get spores off of, it would be great fun to see if they are all different species or what was going on.

Odd shape.
By: Andrew Khitsun (Andrew)
2012-04-09 21:24:59 CDT (-0400)

What bothers me, though, is the odd shape of this concoction. Look at photos #2 & #4, for example. The entire body, including both colors, looks roundish or oval like the thallus of many Arthonia (and others). And then it’s just subdivided into these segments of different colors. if it were two species, why wouldn’t each one form an oval, and then when they reach each other, they would interfere with each other or butt heads or whatever you call it. Here, it appears they conspired to form a perfect oval. On the other hand, photo #3 shows that other scenario.

Great question
By: Jason Hollinger (jason)
2012-04-09 02:22:32 CDT (-0400)

Even if both are species of Arthonia, different species contain different algae: some Trebouxioid algae, others Trentepohlia, yet others nothing at all. Are there chemical differences? Maybe one species is secreting something toxic on its surface and the other isn’t?

What’s going on here?
By: Andrew Khitsun (Andrew)
2012-04-08 22:20:35 CDT (-0400)

I often encounter these Arthonia-like lichen in the woods around here, and I thought that the green ones were simply having some algae living on them, but in general I thought it was the same species (or few closely related ones). This one is a weirdo, though, having two exist side by side. Does it mean there are two species involved – one with algae and one without? I can’t imagine the same species thalli where one would have algae and it wouldn’t spill into another. Compare with observation 86977 & observation 64151.

Created: 2012-04-08 22:13:52 CDT (-0400)
Last modified: 2015-12-16 14:39:06 CST (-0500)
Viewed: 105 times, last viewed: 2017-12-07 14:31:41 CST (-0500)
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