Observation 21285: Parmotrema A. Massal.

Locality: near Clingman’s Dome, a few meters E of the TN-NC border

Habitat: spruce-fir forest on a wet montane ridge

Identification: There are three common species of sorediate Parmotrema with silvery gray lobes in the higher elevations of the southern Appalachians (Dey, 1976). In all three the cortex is K+ yellow (atranorin). The following distributional information is from Dey and the chemical data is from Brodo, et al., 2001.
Parmotrema arnoldii - medula K-, PD-, KC+ red, C-, UV+ blue-white (alectronic acid)
Parmotrema perlatum - medula K+ yellow or orange, PD+ orange, KC-, C- (stictic acid)
Parmotrema stuppeum - medula K+ blood red, PD+ deep yellow or orange, KC-, C- (salazinic acid)

There are three other sorediate species to consider as well. The first two are rare in this area and the third presents a reticulate network of laminar white maculae not seen in the other five species (distributional characterizations from Dey, chemical data from Brodo).
Parmotrema mellissii - very rare, one collection; medula K-, PD-, KC+ pink or red, C-, UV+ blue-white (alectronic acid)
Parmotrema margaritatum - widespread but rare; K+ yellow turning red, PD+ orange (salazinic acid)
Parmotrema reticulatum - common; reticulate network of laminar white maculae and cracks; abundant rhizines; K+ red, PD+ orange, KC-, C- (salazinic acid)

[admin – Sat Aug 14 01:59:30 +0000 2010]: Changed location name from ‘Clingman’s Dome, Great Smoky Mountains NP, North Carolina, USA’ to ’Clingman’s Dome, Great Smoky Mountains National Park, North Carolina, USA’

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Created: 2009-05-24 15:44:30 CDT (-0500)
Last modified: 2010-08-13 23:17:07 CDT (-0500)
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