Description
The lichen has a foliose (leafy) pale yellowish-green thallus up to 20 cm (8 in) broad. Soredia, isidia, and lobules are absent from the thallus surface. Apothecia are common; they have a reddish-brown disc in an urn-shaped receptacle, and measure up to 17 mm (0.67 in) in diameter. The ascospores are more or less spherical, measuring 5.5 by 5.0 μm. Pycnidia are also common; the pycnidiospores are cylindrical, with dimensions of 5.5–5.0 long by 0.5–0.8 μm thick. The expected results of chemical spot tests are: cortex P−, C−, KC+ (yellow); medulla P+ (orange-red), K−, C−, KC−. It contains the secondary compounds usnic acid and physodalic acid as major components, and protocetraric acid as a minor component. [1]
Hypogymnia hypotrypa is morphologically and chemically similar to Hypogymnia flavida, but it lacks apothecia and instead has soredia. These two species are one of three fertile/sorediate species pairs in genus Hypogymnia . H. hypotrypa has a wider range and greater altitudinal distribution, as it is found in locales at altitudes between 65–4,300 m (213–14,100 ft) height, compared with 2,150–4,300 m (7,050–14,100 ft) for H. flavida. [2]
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