Observation 34995: Chrysothrix caesia (Flotow) Ertz & Tehler

When: 2010-02-07

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

Who: Chris Parrish (kitparrish)

Specimen available

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).

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.

Species Lists


thallus, 63x
thallus, 20x
thallus, 32x
thallus, 40x

Proposed Names

62% (2)
Used references: Specimen identified by James C. Lendemer (NY).

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Abundant Trentepohlia?
By: Brendan Hodkinson (brendanhod)
2011-07-31 00:07:25 CDT (-0400)

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 18:40:24 CDT (-0400)
Last modified: 2018-01-29 21:40:12 CST (-0500)
Viewed: 330 times, last viewed: 2018-08-14 16:36:29 CDT (-0400)
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