Observation 101115: Diploschistes muscorum (Scop.) R. Sant.

When: 2011-07-07

Collection location: Lost Cabin Trail, Black Hills, Pennington Co., South Dakota, USA [Click for map]

43.881° -103.551° 1675m

Who: Jason Hollinger (jason)

Specimen available

HABITAT forested outcrops on south/east slopes; SUBSTRATE thin moss over siliceous outcrop in forest; ASPECT shaded.

Proposed Names

87% (1)
Eye3 Eyes3
Recognized by sight
Based on microscopic features: spores all 4 per ascus, up to ~25×12µm at most; hymenium < 100µm high

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks, Jason, for sharing your notes.
By: zaca
2015-09-29 17:54:30 CDT (-0400)

The situation here is more or less as follows:
D. scruposus exists almost everywhere, it has a wide distrubution and I found it in every of the big locations where I’m used to observe lichens. All the others that I have encontered have big populations but only locally; out of there it is very hard to find them. This is the case of D. diacapsis, where the big populations are found on soil close the the sea, and of D. actinostomus, living on man made rock structures.
On the other hand, it is very difficult to find a specimen where one can count the number of spores per ascus. I think this is why on the literature and on websites one find D. scruposus either having 4 spores or 8 spores per ascus, rarely you find (4-)8 or 4(-8).

Revisiting old specimens
By: Jason Hollinger (jason)
2015-09-28 19:53:32 CDT (-0400)

Not obviously associated with Cladonia. I collected a whole bunch of Diploschistes during this trip, trying to find something other than D. muscorum. But now when I look at the specimens, I’m finding all of them, even the ones apparently unassociated with Cladonia, to have:

consistently 4-spored asci
hymenium < 100µm
spores ~25×12µm

I confess that I’ve been ignoring chemistry. Here’s the data I’ve compiled from multiple sources. Does this match your experience at all? I note that there’s precious little to distinguish three species reliably. :(

K+/C+? hymenium spore number spore length number of longitudinal septae pruina
D. muscorum always 80-120µm always 4 18-32µm 1-2 sometimes
D. diacapsis always 110-180µm 4 to 8 20-38µm 1-2 sometimes
D. scruposus sometimes 90-130µm 4 to 8 25-40µm 2-3 never
Hi Jason,
By: zaca
2015-09-28 19:38:17 CDT (-0400)

was there any Cladonia around? and what about the chemistry?

Created: 2012-07-17 14:03:45 CDT (-0400)
Last modified: 2015-09-27 19:02:54 CDT (-0400)
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