Observation 20531: Usnea subscabrosa Nyl. ex Mot.
When: 2009-02-08
No herbarium specimen

Notes: 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.

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

Common name: horny beard lichen

Species Lists

Images

41767
Dotson Point Trail, 08 Feb 2009
41768
Dotson Point Trail, 08 Feb 2009
41769
Dotson Point Trail, 08 Feb 2009
41770
Dotson Point Trail, 08 Feb 2009
41771
Dotson Point Trail, 08 Feb 2009
41772
Dotson Point Trail, 08 Feb 2009
41773
branch, 16x
41774
soredia, 25x
41775
soredia, 40x
41776
soredia, 40x
41777
x-section of branch, 115x

Proposed Names

28% (1)
Eye3
Recognized by sight
56% (1)
Eye3 Eyes3
Recognized by sight: By comparison with Observation 20520

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

Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2009-04-23 15:02:22 PDT (-0700)
Last modified: 2009-04-23 15:02:22 PDT (-0700)
Viewed: 75 times, last viewed: 2016-10-21 10:59:54 PDT (-0700)
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