ACCORDING to Butler and Jones1, two reports only of the finding of cleistocarps of the oak mildew in Great Britain have been published, the first2 referring to six cleistocarps on one leaf of Q. robur at Bricket Wood, Herts, in October 1945, the second3 to “a few perithecia on leaves of Quercus robur” at Aberystwyth in October 1947. A third collection (Herb. I.M.I. 19315) identified by E. A. Ellis as Microsphæra alphitoides on Q. robur, from Wheatfen Broad, Surlingham, Norfolk, also in October 1947, is deposited at the Commonwealth Mycological Institute (information from S. J. Hughes).
Butler, Sir E. J., and Jones, S. G., “Plant Pathology”, 901 (Macmillan, 1949).
Robertson, N., and Macfarlane, I., Trans. Brit. Mycol. Soc., 29, 219 (1946).
Knoyle, Mary J., Nature, 161, 938 (1948).