Collection location: Look Rock, Chilhowee Mountain, Blount Co., Tennessee, USA [Click for map]
Locality: 35°38’0.34"N, 83°56’29.38"W, el. 805 m, Foothills Parkway.
Substrate and habitat: Growing on exposed native rocks and on hand-hewn rocks forming the curb of a visitor parking lot near the ridge-like crest of Chilhowee Mountain in an open deciduous forest.
medulla C-, K+ yellow (immediately), KC- (dissolves the yellow), Pd+ yellow to orange (quickly)
Identification: The three species of Xanthoparmelia reported from the adjacent Great Smoky Mountains NP (Bennett-Wetmore lichen checklist for GSMNP) can be distinguished as follows (Hinds and Hinds, 2005, pp.518-522):
Xanthoparmelia conspersa (isidiate; lower cortex black)
Xanthoparmelia cumberlandia (nonisidiate; lower cortex light to dark brown)
Xanthoparmelia plittii (isidiate; lower cortex tan to dark brown)
These photos are of a densely isidiate Xanthoparmelia with a pale creamy lower cortex, so I take them to represent Xanthoparmelia plittii.
Common name: Plitt’s rock-shield
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Created: 2010-03-30 13:51:49 PDT (-0700)
Last modified: 2010-04-11 18:42:26 PDT (-0700)
Viewed: 408 times, last viewed: 2018-11-30 04:32:09 PST (-0800)