Collection location: Sewanee, Franklin Co., Tennessee, USA [Click for map]
Location: 35°12’15.59"N, 85°55’13.48"W, el. 589 m. Central campus.
Characterization: Thallus pale grayish green, largely smooth but with a few conspicuous areas of whitish reticulate ridges giving the impression of “pressure ridges.” Lobes broad, strongly ruffled, those on one side of the thallus seemingly rolled back and with thickened borders covered by marginal soralia, while the lobes on the other side of the thallus are much thinner and flatter and with rather regularly positioned black setae which are somewhat curly but unbranched. Exposed undersides of the lobes almost entirely white, but with a minor area stained brownish.
Substrate: Found on the ground growing on a small broken branchlet about 15 mm wide and 10 cm long. Numerous similar specimens of other species of green foliose lichens on fragments of bark and twigs resting on the ground in the same area suggest that they were knocked down by recent rainstorms from nearby tall oaks and tulip-poplars.
Characterization: ruffle lichen with
(1) pale silvery gray thallus with ruffled margins
(2) ascendent marginal lobes displaying extensive white patches on their undersurfaces
(3) prominent marginal cilia
(4) lumpy, irregularly coallescing soredial patches tracking the margins of ascendent lobes
(5) cortex K+ yellow (atranorin)
(6) medulla K+ yellow turning red
Common name: powdered ruffle lichen
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Parmotrema hypotropum is a very common canopy lichen here in North Carolina. However, there is a sister species, P. hypoleucinum, which is distinguished by a PD reaction in the medulla: PD+ yellow is P. hypotropum, PD+ orange is P. hypoleucinum.