Observation 34869: Pyxine sorediata (Ach.) Mont.

When: 2010-03-12

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

Who: Chris Parrish (kitparrish)

Specimen available

Location: 35°12’38.36"N 85°54’0.40"W el. 587 m, Beckwith’s Point Trail.

Substrate and habitat: Growing 2 m above the ground on a slender hardwood tree about 15 cm DBH, in oak-hickory woodland near the rim of a widening canyon, on the western rim of the Cumberland Plateau.

cortex: UV-
medulla: C- (bleaches the yellow), K-, KC-, Pd-.

Identification: Pyxine sorediata is a fairly circular rosette lichen with rounded, pruinose lobe tips; white borders to the lobes where upper and lower cortex fail to completely connect with each other; and puffy, punctate marginal soralia. Locally at least, the thallus of Pyxine sorediata has a characteristic blue-green aspect, may reach about 8 cm in diameter, and is UV-. The related Pyxine subcinerea, which also occurs here, is more yellow-green and a good deal smaller with a diameter of 2 or 3 cm, and is UV+ bright banana yellow.

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

Voucher specimen:
United States, Tennessee, Franklin County, Sewanee, Beckwith’s Point Trail. 12 Mar 2010. Chris Parrish 0074, det. James C. Lendemer (NY).

Common name: mustard lichen.

Species Lists


pruina, 50x
yellowish medulla, 100x
soralia, 32x
coarse soredia, 40x

Proposed Names

85% (1)
Used references: Hinds and Hinds, 2005, pp.433-434

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= Observer’s choice
= Current consensus


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Created: 2010-03-17 00:05:48 CDT (-0400)
Last modified: 2010-06-09 03:00:47 CDT (-0400)
Viewed: 301 times, last viewed: 2019-02-02 07:22:36 CST (-0500)
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