Collection location: Sewanee, Franklin Co., Tennessee, USA [Click for map]
Location: 35°13’49.26"N, 85°57’47.14"W, el. 575 m, Dotson Point Trail.
Substrate: Growing on the trunks of trees, often about 2 m above the ground.
Habitat: Oak-hickory woodland on the western rim of the Cumberland Plateau.
cortex C-, K-, KC-, UV-
medulla C-, K- (going dingy, dissolving the yellow medulla color)
Characterization: corticolous blue-green rosette lichen with
(1) outermost lobes rounded
(2) lobes with prominent white lateral margins (pseudocyphellae)
(3) pillow-like mounds of soredia
(4) medulla pale yellow to creamy under algal layer
(5) rhizines short, gray, mostly not conspicuous on lobes or margins; row of short, squat marginal teeth along lobe margin
(6) central undersurface black
(7) undersurface of outer lobes pale tan, with cortex (not fibrous or cottony)
Voucher specimen: Tennessee, Franklin County, Sewanee, Dotson Point Trail, 15 Mar 2009, Chris Parrish 0009, det. Gary Perlmutter (NCU)
Common name: mustard lichen
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