When: 2017-10-03

Collection location: Brooks Bluff State Natural Area, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available


Proposed Names

29% (1)
Based on microscopic features: Lower surface edge dark brown; sorediate
Based on chemical features: Medula K+r
84% (1)
Used references: Jim Bennett

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= Observer’s choice
= Current consensus


Add Comment
They are similar from this distance
By: Jason Hollinger (jason)
2018-02-03 19:29:33 CST (-0500)

Since Jim has actually seen the specimen(!) I have to defer. :)

JB thinks it’s P.margaritatum
By: Andrew Khitsun (Andrew)
2018-02-03 18:45:02 CST (-0500)

By description it looks like they are very similar

P. stuppeum has same chemistry
By: Jason Hollinger (jason)
2017-10-27 21:14:05 CDT (-0400)

but has broader lobes and much longer, linear soralia along the margins. And doesn’t have the tiny cracks in the upper surface, although those cracks can be very subtle in some specimens of P. reticulatum (like this one!) Not sure about the lower surface, but I think P. reticulatum also has a black to dark brown lower surface right to the margin.

That group (the ones with finely cracked cortex, used to be called Rimelia) is also distinguished by having rhizines of two lengths right to the edge. I think P. stuppeum has rhizines progressively smaller towards the edge, but in any one spot all of the same length. And I think there is a broader margin without rhizines in P. stuppeum. (Although nothing like P. hypotropum group with its conspicuous naked white splotches.)

Created: 2017-10-27 19:28:59 CDT (-0400)
Last modified: 2018-02-03 19:29:33 CST (-0500)
Viewed: 48 times, last viewed: 2019-09-03 15:25:38 CDT (-0400)
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