Cetraria chlorophylla (Willd.) Vainio

    Thallus foliose, 2-5 cm max. length, made of lobes 1-3 cm long and 0.5-1 cm wide, thin and translucent, loosely attached to substratum and erected; margin wavy, incised with soralifer isidia producing labriform marginal soredia (these soredia are seldom laminal), upper surface brown-greenish, olivaceous to brownish when dry, greenish when moist, lower surface cream-greenish to pale brown with some whitish rhizines. Apothecia scarce, 1-2 mm diam., crenulate margin. Ascospores globose,  6-8 x 4-6 µm. Photobiont : Trebouxia. Chemical spot tests negative. On bark of trunks and main branches of well lit trees preferably in mountainous regions, very seldom on rocks. See also Platismatia glauca that grows to a bigger size, with non translucent lobes and cortex K+ yellow  and lower surface dark brown to blackish towards the center.*