Observation 34508: Parmotrema xanthinum (Müll. Arg.) Hale

When: 2010-02-21

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

Who: Chris Parrish (kitparrish)

Specimen available

Location: 35°13’21.51"N, 85°57’3.86"W, el. 572 m, Rutledge Point Trail.

Substrate and habitat: Growing on an exposed sandstone cliff face, in oak-dominated, eastern deciduous woodland near the western rim of the Cumberland Plateau.

cortex: C-, K-, KC-, Pd- [KC+ yellow expected, usnic acid]
medulla: C-, K-, KC-, Pd-

Identification: A yellow-green, saxicolous Parmotrema with prominent marginal cilia and abundant cylindrical, branching, or coraloid isidia; short setae sometimes emerging from the isidia; lower cortex black. Parmotrema madagascariaceum is “morphologically identical” (Showman and Flenniken, 2004, p.159) and has “the same geographic range” (Brodo, et al., 2001, p.502), but it has a different chemistry.

Sharnoff’s Parmotrema xanthinum gallery
CNALH images, description, and locality map, and a larger, interactive locality map.

Voucher specimen:
United States, Tennessee, Franklin County, Sewanee, Rutledge Point Trail. 21 Feb 2010. Chris Parrish 0065, det. James C. Lendemer (NY).

Common name: green ruffle lichen

Species Lists


marginal isidia, 40x
laminal isidia, 50x
isidia with bristles, 80x
black lower cortex, 16x

Proposed Names

85% (1)
Used references: By comparison with MO Observation #19070. Voucher specimen identified by James C. Lendemer (NY).
Based on chemical features: medulla: C-, K-, KC-, Pd-

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= Observer’s choice
= Current consensus


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Created: 2010-03-04 22:25:32 CST (-0500)
Last modified: 2010-06-09 02:39:06 CDT (-0400)
Viewed: 276 times, last viewed: 2019-02-02 05:31:48 CST (-0500)
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