Abstract
Phaeophila tenuis (Kylin) R. Nielsen (= Entocladia tenuis Kylin) is reported for the first time from British shores. The existence in Britain of a form intermediate in morphology between P. tenuis and Phaeophila engleri Reinke is also noted. The relationships of this form and P. tenuis to each other and to Phaeophila dendroides (Crouan frat.) Batt. are discussed with reference to the effect of host-shell species and habitat on morphology.

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