Observation 34995: Arthonia caesia (Flotow) Körber
When: 2010-02-07
Herbarium specimen reported

Notes: Locality: 35°12’47.92"N, 85°55’20.20"W, el. 586 m. Woodlands.

Substrate and habitat: Growing on a branch of scarlet oak, Quercus coccinea, brought to the ground by recent rain storms, in a park-like residential area bordering oak-dominated eastern deciduous woodland at the western rim of the Cumberland Plateau.

Identification: “The combination of the small, blue-gray, marginless ascomata on a powdery yellowish crust makes this lichen easy to identify,” (Brodo, Sharnoff, and Sharnoff, 2001, p.164).

References:
Sharnoff’s Arthonia caesia gallery
CNALH images and locality map, and a larger, interactive locality map.

Voucher specimen:
United States, Tennessee, Franklin County, Sewanee, Woodlands. 07 Feb 2010. Chris Parrish 0050, det. James C. Lendemer (NY).

Common name: frosted powder lichen.

Proposed Names

85% (1)
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Used references: Specimen identified by James C. Lendemer (NY).

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Abundant Trentepohlia?
By: Brendan Hodkinson (brendanhod)
2011-07-30 23:07:25 CDT (-0500)

This specimen is especially yellow! I wonder if the Trentepohlia algal symbiont is just really abundant and is growing out this thallus. Trentepohlia tends to be orangy in color when it grows apart from lichen-forming fungi.

Created: 2010-03-22 16:40:24 CST (-0600)
Last modified: 2010-03-22 16:40:24 CST (-0600)
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