Consortium of Lichen Herbaria
- building a Global Consortium of Bryophytes and Lichens as keystones of cryptobiotic communities -
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Placynthiella icmalea (Ach.) Coppins & P. James  
Family: Trapeliaceae
[Biatora fuliginea (Ach.) Fr., moreBiatora fuliginea var. fuliginea (Ach.) Fr., Biatora uliginosa var. fuliginea (Ach.) Fr., Epinyctis fuliginea (Ach.) Wallr., Lecidea fuliginea Ach., Lecidea fuliginea f. fuliginea Ach., Lecidea fuliginea f. saxicola Harm., Lecidea fuliginea var. fuliginea Ach., Lecidea fuliginea var. fuscovirens Vain., Lecidea icmalea Ach., Lecidea uliginosa var. fuliginea (Ach.) Link, Pannularia perfurfurea Nyl., Parmeliella corallinoides f. perfurfurea (Nyl.) Gyeln., Parmeliella perfurfurea (Nyl.) Zahlbr., Patellaria fuliginea (Ach.) Spreng., Placynthiella perfurfurea (Nyl.) Gyeln., Saccomorpha icmalea (Ach.) Clauzade & Cl. Roux]
Placynthiella icmalea image
Andrew Khitsun
  • Greater Sonoran Desert
  • Resources
Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.
Thallus: continuous to dispersed/scattered, effuse, composed of isidiate to minutely coralloid-elongated granules granules: 25-150(-200) µm tall, 25-50 µm in diam. surface: brown (blackish or red-brown) Apothecia: usually scattered when present, rarely crowded and confluent, 0.2-0.6 mm in diam. exciple: paler than disc (sometimes darkened in Sonoran specimens) epihymenium: brown hymenium: pale brown, 60-85 µm tall, I+ reddish orange hypothecium: pale brown, K- asci: cylindrical-clavate, 8-spored ascospores: hyaline, simple (to 1-septate), ellipsoid, 8-12 x 4-5 µm Spot tests: thallus (squash) K-, C+ pink/red, KC+ red, P- Secondary metabolites: thallus with gyrophoric acid, +lecanoric acid, +5-O-methylhiascic acids. Substrate and ecology: in a wide range of acidic habitats, occurring on dead bark and wood of fallen trees and stumps, rotting fence-posts, plant debris, tree roots, +horizontal branches, shaded siliceous rocks and humus-rich soils, also a primary colonizer of burned areas World distribution: North America, Europe and Australia Sonoran distribution: Arizona and Chihuahua. Notes: Placynthiella icmalea is easily noticed when growing as a wide-spreading, brown, isidiate crust, but often also occurs in small patches as a less conspicuous, scattered, sterile crust of coralloid granules among other lichens, including other species of Placynthiella. It is easily distinguished from other Sonoran species by the C+ pink reaction of the thallus and by the apothecia, that have margins paler than the disc.
Placynthiella icmalea
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Andrew Khitsun
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Andrew Khitsun
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Christopher Raithel
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394
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