Observation 20531: Usnea subscabrosa Nyl. ex Mot.

When: 2009-02-08

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

Who: Chris Parrish (kitparrish)

No specimen available

Location: 35°13’49.26"N, 85°57’47.14"W, el. 575 m, Dotson Point Trail.

Substrate and habitat: Growing on a nearly flat sandstone rock about 20 cm long resting on the ground, in oak-dominated eastern deciduous woodland at the rim of the western escarpment of the Cumberland Plateau.

Identification: Usnea is generally acknowledged to be a difficult genus, but the first specimens and photos from Sewanee seem to sort into three groups (Harris and Ladd, 2005, pp.235-236; Hinds and Hinds, 2007, pp.487-511):
U. strigosa, with dramatic, spiny apothecia and long fibrils; lacking soralia and isidiomorphs
U. subscabrosa, on rocks; with puffy, pillow-like soralia and associated isidiomorphs
U. pensylvanica, on bark; abundant isidiomorphs, isolated or in clumps, often with soralia at their broken bases; cortex with orange patches, soralia and cracks Pd+ orange
In the Ozarks, the last two species are each found on both rocks and bark, and there may be additional species to be found here.

Sharnoff’s Usnea subscabrosa gallery
CNALH images and locality map, and a larger, interactive locality map.

Common name: horny beard lichen

Species Lists


Dotson Point Trail, 08 Feb 2009
Dotson Point Trail, 08 Feb 2009
Dotson Point Trail, 08 Feb 2009
Dotson Point Trail, 08 Feb 2009
Dotson Point Trail, 08 Feb 2009
Dotson Point Trail, 08 Feb 2009
branch, 16x
soredia, 25x
soredia, 40x
soredia, 40x
x-section of branch, 115x

Proposed Names

28% (1)
Recognized by sight
56% (1)
Recognized by sight: By comparison with Observation 20520

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= Observer’s choice
= Current consensus


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Created: 2009-04-23 18:02:22 CDT (-0400)
Last modified: 2009-04-23 18:02:22 CDT (-0400)
Viewed: 77 times, last viewed: 2019-01-28 05:44:47 CST (-0500)
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