The genus Cetraria Ach. has been found to be represented by twenty-four species distributed in the temperate and alpine Himalayas of India and Nepal. A detailed morpho-taxonomic study of the twenty-two species has been presented in the paper. Cetraria endoxanthoides Awas. is described as a new species and C. endoxantha (Hue) Awas., C. isidioidea (Ris.) Awas. and C. nephromoides (Nyl.) Awas. are new combinations. Cetraria chlorophylla (Willd.) Vain., C. delavayi (Hue) Sato, C. laeteflava Zahlbr., C. rhytidocarpa Mont. et v. d. Bosch and a taxon closely related to C. potaninii Oxner are reported from the area for the first time.
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