When: 2009-03-15

Collection location: Sewanee, Franklin Co., Tennessee, USA [Click for map]

Who: Chris Parrish (kitparrish)

Specimen available

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)

Sharnoff’s Pyxine sorediata gallery
CNALH images, description, and locality map, and a larger, interactive locality map.

Voucher specimen: Tennessee, Franklin County, Sewanee, Dotson Point Trail, 15 Mar 2009, Chris Parrish 0009, det. Gary Perlmutter (NCU)

Common name: mustard lichen

Species Lists


Dotson Point Trail, 2009_03_15
Dotson Point Trail, 2009_03_15
thallus, 7.1x
thallus, 10x
white margins, 25x
marginal soredia, 20x
mounds of soredia, 10x
mounds of soredia, 12.5x
mounds of soredia, 16x
medulla yellow under cortex, 32x
medulla yellow under cortex, 50x
creamy medulla under algal layer, 100x
cortex of undersurface of lobe, peg-like teeth,50x
undersurface, peg-like teeth, 32x
black central undersurface, 20x
branching rhizines, 63x

Proposed Names

28% (1)
Used references: Brodo, Sharnoff, Sharnoff, pp. 617-619

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= Observer’s choice
= Current consensus


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