When: 2010-02-18

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

Who: Chris Parrish (kitparrish)

Specimen available

35°12’15.59"N, 85°55’13.48"W, el. 589 m, central campus.

Substrate and habitat: Growing on the boles of several hardwood trees, in a park-like area of remnant oak-dominated eastern deciduous woodland at the western rim of the Cumberland Plateau.

thallus: C-, K+ orangish yellow, KC- (dissolves much of the orangish yellow), Pd+ bright sulphur yellow

Pale gray, velvety-appearing crustose lichen with thallus diameter from a few cm to 8 or 10 cm, growing on the boles of deciduous trees within a few m of the ground. On closer examination, the “abundant isidioid hollow pustules … are diagnostic” (Harris and Ladd, 2005, p.149). The chemistry is also distinctive: thallus “Pd+ orange, K+ deep yellow, KC-, C-” (Brodo, p.424). Under a microscope, the thallus presents an unusual surface, appearing as though it were covered with wrinkled cellophane.

Sharnoff’s Loxospora pustulata gallery
CNALH images and locality map, and a larger, interactive locality map.

Voucher specimen:
United States, Tennessee, Franklin County, Sewanee, central campus. 18 Feb 2010. Chris Parrish 0052.

Common name: pustule ragged-rim lichen

Species Lists


thallus, 20x
thallus, 40x
thallus, 63x
thallus, 115x
x-section of thallus, 115x
x-section of thallus, 115x
x-section of thallus, 115x

Proposed Names

28% (1)
Used references: Brodo, Sharnoff, and Sharnoff, 2001, pp.424-426; Harris and Ladd, 2005, pp.149

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= Observer’s choice
= Current consensus


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Created: 2010-02-18 20:03:38 CST (-0600)
Last modified: 2010-02-18 20:03:38 CST (-0600)
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