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On a large outcrop of limestone. I'm unsure if these are young versions of the same Dermatocarpon I find around here or a different species? I usually find larger, single ones, not these little clumps.

Some soredia are green/yellowish?
Collected from hard sandstone

03/07/2024
Med K-, cortex K-
White medulla throughout

Lower surface dark brown and lighter brown to white near lobe margins
Squarrose rhizines

Discovered and photographed by Michael Terry. Rock outcrop under dense canopy of sugar maple, fir, cedar, and other mixed woods. A few clumps within 20 feet of each other. Rachies appear slightly glandular, long-triangular shape like C. bulbifera but without bulblets on frond underside, occasional vestiges in axes. A sample was collected (Terry #5085) and sent to the University of Michigan Herbarium; Dr. Anton Reznicek confirmed it is Cystopteris laurentiana on 3/6/2023.

On a bluff prairie dolomite outcrop with Calogaya pusilla. A new species for Wisconsin if so.

Edit: Yellow pruinose lobate thallus with central laminal soredia and/or labriform soralia on lobe tips. On calcareous rock.

Using the Wilk 2012 key to calcicolous Caloplaca of the Polish Carpathians, this keys to Caloplaca/Calogaya decipiens. Main features being soredia on lobe tips and/or in center of thallus concolorous with the thallus, and having a lobate thallus. Next closest would be Leproplaca cirrochroa, which has yellow soredia on the lobe bases and a more orange thallus, and often has lost the central parts of the thallus (which is typical of L. cirrochroa around here).

M.J. Oldham 37807; specimen record; replicates at TRT, NHIC# 09250, CAN; identified by M.J. Oldham 2010, !P.W. Ball April 2012; locally common; open rocky summit; mossy edges of rock. with Empetrum nigrum, Picea mariana, Rubus chamaemorus, Vaccinium vitis-idaea, Ledum decumbens, Andromeda polifolia; Precambrian granitic bedrock outcrop. See Oldham, Michael J., and Samuel R. Brinker. 2011. Additions to the vascular flora of Ontario, Canada, from the Sutton Ridges, Hudson Bay Lowland ecoregion. Canadian Field-Naturalist 125(3): 241–247.

Growing on lower trunk of small Pinus banksiana in open, sandy mixed woodland. ID uncertain, but based on scrobiculate upper thallus with what seem to be a small amount of developing pseudocyphellae and soredia, and with rounded brownish lobe tips, but something about the upper surface seems odd, and also the black underside is definitely weird.

First state record discovered in May and collected July 30. Duplicates to be sent to University of Wisconsin, University of Michigan, and Michigan State University. Present on high hummocks throughout this peatland, but this collection from underneath spruces along a minerotrophic channel draining a large spring. Habitat shot & comparisons with C. trisperma in last 6 photos.

reticulately ridged upper surface, black lower surface, laminal soralia. K+y, KC-, C-, UV-. As far as I can tell, this is the first time this species has been observed in WI. The chemistry tests rule out other possibilities. On small tamarack branch, in tamarack bog.