The first account of the lichen genus Pertusaria (Pertusariaceae) on the island of Rarotonga (Cook Islands) is given. A total of 8 taxa are recorded, of which 5 are new to science viz: Pertusaria atroguttata, P. homilocarpa, P. megacarpa, P. rarotongensis and P. rarotongensis var. stictica. A key to the species is provided.
Author Biographies
Alan W. Archer, National Herbarium of New South Wales
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