The occurrence of Ezo epiyessoense Adey, Masaki & Akioka (Rhodophyta, Corallinaceae) in England with a summary of parasitism and endophytism in nongeniculate Corallinaceae

`The parasitic, nongeniculate, coralline red alga Ezo epiyessoense (Rhodoph yta, Corallinaceae) was described in 1974 by Adey, Masaki & Akioka on the b asis of specimens growing on Lithophyllum yessoense in Japan. The authors c onsidered Ezo to be an adelphoparasite because it resembled its host taxono mically in being a member of the coralline subfamily Lithophylloideae. The species had not been recorded outside Japan until the present observation i n England where it was found growing on another lithophylloid species, Tita noderma pustulatum. The structure of the English material of E. epiyessoens e is described and shown to closely resemble that of the type material desp ite its occurrence on a different host species. Tetrasporangia and trispora ngia are recorded for the first time in Ezo. A summary is given of known no ngeniculate coralline parasites, semi-endophytes and outgrowths. (C) ADAC/E lsevier, Paris.