Lichenologist 24, 4: 407 (1992).
Basionym: Psoroma crawfordii Müll. Arg., Flora, Regensburg 69: 287 (1886).
Protolog: Data lacking.
Protolog type data: Australia meridionalis, prope cataractas McLeay River, A. R. Crawford (G - holotype).
Type locality: Australia, New South Wales, Oxley-Wild-Rivers-Nationalpark, near McLeay River falls, A. R. Crawford (G - holotype).
Type locality coordinates: 30°52'29"S, 153°1'23"E; -30.874722°, 153.023056°.
Molecular barcode: Data lacking.
Thallus: foliose, irregularly spreading, but often growing in small, shallowly incised rosettes up to 0.7 cm diam. Lobes + broadly cuneate, 0.7-1.5(-2) mm wide, appressed, + entire or shallowly incised, with marginal, coarse-grained soralia, often nearly labriform with soredia developing on the upturned lower surface. Upper surface smooth or faintly pruinose, normally citrine-yellow to yellow. Lower surface whitish, with white rhizines. Apothecia extremely rare, similar to those of C. concolor, but spores possibly narrower (see Poelt & Reddi 1969: 14) (Jørgensen & Galloway 1992: 407).
Photobiont: Data lacking.
Chemistry: Calycin, pulvinic dilactone and pulvinic acid by TLC (Jørgensen & Galloway 1992: 407).
Ecology: Data lacking.
Distribution Type: Tropical-subtropical. Australia: New South Wales, Australia: Queensland, Philippines, China: Yunnan, Nepal, Cape Verde Islands: Santo Tiago, Cape Verde Islands: Santo Antao, Cape Verde Islands: Fogo, Spain: La Palma.
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