Platismatia glauca (L.) W. L. Culb. & C. F. Culb. — Overview

Varied Rag Lichen learn more about names for this taxon

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Description

 Thallus: foliose to subfruticose, up to c. 3 cm across [up to 8-15 cm elsewhere], thin (< 1 mm thick), papery; lobes: few to numerous, upcurved, up to 2-5 (-20) mm wide; margins "ragged" [elsewhere sometimes branched and divided into fruticose lobes]; upper surface: whitish, whitish green, pale blue-greenish gray, to pale greenish tan (turning green to olive or greenish gray or tan when wet), or occasionally tinged with yellow or reddish, often with darkened areas, shiny to matt, smooth or becoming incompletely and inconspicuously wrinkled to strongly reticulately wrinkled, without distinct pseudocyphellae but ± maculate in places; soredia: initially white and granular, sometimes becoming brown and isidioid (simple to coralloid), often in laminal, rounded to irregular soralia or marginal, crescent-shaped soralia; upper cortex: c. 15-25 µm thick; medulla: white, c. 60-200 µm thick, I+ lavender; lower cortex: 16-25 µm thick; rhizines: absent to few ( to many), brown or black, simple or branched; lower surface: jet black towards center, or irregularly mottled or spotted brown or white towards the margins; shiny, smooth or reticulately wrinkled and coarsely and sometimes foveolate; Apothecia: very rare, 0.5-1 cm broad, marginal, perforate or not; without algae below; hymenium: 34-56 µm; "subhymenium" 16-52 µm, I+ lavender to bright purple; asci: clavate, I+ blue or blue-green, 8-spored; ascospores: hyaline, simple, ellipsoid to ovoid, 3.5-8.5 x 3-5 µm; Pycnidia: not seen; Spot tests: cortex K+ yellow, C-, KC-, P+ yellow; medulla K-, C-, KC-, P-, UV-; Secondary metabolites: cortex with atranorin and chloroatranorin; medulla with caperatic acid.; Substrate and ecology: on trees (usually conifers) or shrubs, or wood, occasionally on rocks and rarely soil; in open woods; World distribution: circumpolar and circumboreal in the Northern Hemisphere, Macaronesia; southern South America and E Africa; Sonoran distribution: southern California, coastal mountains in chaparral and on Pseudotsuga macrocarpa.; Notes: It is characterized by its loosely attached, suberect, greenish gray, smooth to ± wrinkled thallus with broad, dissected, rounded lobes with marginal soredia (often mixed with isidia) and a mottled brown and white lower surface, nearly without rhizines. It is extremely variable over its full range. Some forms might be confused with Esslingeriana idahoensis [non-Sonoran; with a black lower side and often black rimmed upper side], Cetrelia species, which have more distinct pseudocyphellae on the upper surface, or Parmotrema species, which usually have marginal cilia and a different chemistry. The two specimens seen from the Sonoran region are rather small and poorly developed. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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