IDENTIFICATION: marbled, silvery grey, foliose thallus with characteristic jumbled, arching ridges; abundant laminal pustular soralia; at least three thalli with one or a few apothecia with chocolate brown disks, the larger apothecia with irregular, lumpy white borders somehow matching the rough style of the pustular soralia; I observed only white medulla, but it is meant to be pale yellow; lobe tips sometimes tinged pale brownish and with pruina; short, black, unbranched rhizines sometimes visible reaching out from underneath partially raised lobe tips

SUBSTRATE: locally abundant, growing on sandstone rocks and boulders on a talus slope under the cliffs forming the rim of the Cumberland Plateau

HABITAT: Appalachian cove deciduous forest


NOTE: this fertile thallus was less than a meter away from MO Observation 439988, on the neighboring sandstone boulder

Species Lists


Proposed Names

61% (2)
Used references: Tripp and Lendemer, 2020, p.303

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Add Comment
It’s not as clear in this photo
By: Jason Hollinger (jason)
2020-11-24 21:10:42 CST (-0600)

It’s not obvious, even in person, but even more so in photos, because cameras like to overexpose the white spots, and they lose all their color quickly.

Gorgeous specimens. This species obviously really likes it in your area!