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Material of this study consists of c. 4650 grass samples gathered on leys, field borders and forests throughout the country during 1966-1974. Collections of Department of Plant Pathology, and Botanical Museum, University of Helsinki, and Mr. Pentti Alanko's herbarium were also examined. Ovularia pusilla (Ung.) Sacc. et D. Sacc. was found on 29 samples of 11 grass species: Agrostis borealis Hartm., A. tenuis Sibth., Calamagrostis canescens (Web.) Roth, C. epigeios (L.) Roth, C. purpurea Trin. , Cinna latifolia (Trevir.) Griseb., Deschampsia caespitosa (L.) PB. , D. flexuosa (L.) Trin., Festuca rubra L., Hierochloii odorata (L.) PB., and Poa annua L., throughout the country, being most common on P. annua. Hadrotrichum virescens Sacc. et Roum. was found on nine specimens of four grass species : Agropyron repens (L.) PB., Agrostis stolonifera L., A. tenuis, and Poa Chaixii Vill. in some places as far as Lapland. Deightoniella arundinacea (Sacc.) Hugh. was found on three specimens of three grass species: Calamagrostis purpurea, Molinia coerulea (L.) Moench, and Phragmites communis Trin. in the neighbourhood of Helsinki. Discosia artocreas (Tode) Fr. was found on two specimens of two grass species : Lolium perenne L ., and Melica nutans L. in Helsinki. All these fungi were found to be accidental and infrequent, usually on wild grasses on field borders, and forests . All fungi are of negligible importance. Material and Methods This study is based on c. 4650 grass samples gathered throughout the country on leys, field borders, and forests . In Finland numerous wild grasses are common throughout the country ( H u LT :EN 1971). Besides several grass specimens were examined in collections of Department of Plant Pathology, HPP, Botanical Museum, University of Helsinki, H, and Mr. Pentti Alanko's herbarium. M 0 and RAATIKAINEN (1971). Collectors were Pentti Alanko = P.A., Hilkka Koponen = H.K., and Kaiho Makela = K.M. Microscopic slides were prepared from all the samples bearing symptoms of the fungi. The slides were preserved in lactic-acid and lactophenol solution, where the fungi were also measured and photographed. The microphotographs were taken by Kaiho Makela. Abbreviations of the Finnish biological provinces are in accordance with HEIKINHEIResults and Discussion Ovularia pusilla (Ung.) Sacc. et D. Sacc. Syll. Fung. 18 : 531, 1906, syn. Ramularia pusilla Ung. Exanth. Pfl. p. 169, 1833 (cf. 38 SACCARDO 1906: 531); R. pulchella Ces. Bot. Zeit. 11 : 238, 1853; 0 . pulchella (Ces.) Sacc. Syll. Fung. 4: 145, 1886 (cf. LINDAU

Ovularia pusilla, Hadrotrichum virescens, Deightoniella arundinacea and Discosia artocreas on grasses in Finland