1. Fungi associated with ambrosia beetles in Great Britain; 2. On the perithetical development and sexuality in two species of Ophiostoma; 3. Studies on Ophiostoma and Ceratostomalla, their association with the beetles and role in the blueing and sep-stain of timber; 4. Seedling blight and foot-rot of cereals caused by Fusarium avenacem (Fr.) Sacc. and F. culmorum (W. G. Sm.) Sacc.