Abstract
Eight species of epiphytic crustose coralline algae (Corallinaceae, Rhodophyta) were identified from southern Norway. The species were studied by light microscopy and scanning electron microscopy (SEM), and were identified by vegetative and reproductive features and the morphology of the spore germination discs. The four genera Titanoderma Nägeli, Hydrolithon Foslie, Pneophyllum Kützing and Melobesia Lamouroux were represented. Hydrolithon cruciatum (Bressan) Y. Chamberlain and Pneophyllum myriocarpum (P. ' H. Crouan) Y. Chamberlain were new records for Norway. Titanoderma pustulatum (Lamouroux) Nageli was represented by the two varieties: var. pustulatum (Lamouroux) Nageli and var. confine (P. ' H. Crouan) Y. Chamberlain.
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