82 



Mycologia 



Handbook (see Mycologia 9: 167), p. 744, also gives fairly good 

 illustrations of the fungus. 



Both paddy and upland rices are infected. The fungus usually 

 appears as minute spots on the leaf blade, about the size of sesame 

 seeds, often elongated or confluent, forming larger spots. In such 

 infected leaves, especially when the plant is young, the discoloration 

 and withering soon follow, proceeding from the leaf -tip, often 

 causing death of the entire plant. In an advanced stage of the 

 disease characteristic brown velvety bodies are produced from the 

 surface of the diseased spots. 



K. Hara (in Hara's Ine no Byogai, Diseases of the rice plant, 

 Gifu-ken, June, 1918, p. 61, in Japanese) states that the Japanese 

 rice blight fungus might be identical with that which had been 

 described by Breda de Haan as Hclminthosporium Oryzae (in 

 Bull. lTnstit. Bot. Buitenzorg., no. 6: 11. 1900), though the de- 

 scription of the latter is rather imperfect. The present species, 

 however, differs very strikingly from H. macrocarpum Grev. in 

 the shape of the conidia which are obclavate or fusoid, whereas in 

 the latter they are simply clavate (refer Fig. 249 CH of Engler & 

 Prantl, Nat. Pflanzenfam. I, I**: 479). 



The disease was first known in Japan about 1895, but is now 

 established everywhere as far as Formosa. Recently prevention 

 through seed treatment and spraying with various kinds of fungi- 

 cides has proved to be effective. See Nishikado, Y., in Byochu- 

 gai Zasshi (Journ. PI. Prot.), 5°: 693-712, Sept., 1918, and Suye- 

 matsu, N., ditto, 7 1 : 26-29, Jan., 1920 (both in Japanese). In a 

 series of inoculation tests, a number of rice-plant varieties as well 

 as wild grasses was examined by Suyematsu in connection with 

 the susceptibility and resistance to the Helminthosporium rice 

 blight. See Suyematsu, N., in Nogaku Kwaiho (Journ. Sci. Agric. 

 Soc), Tokyo, no. 212: 279-286, Apr., 1920; no. 214: 443-446, 

 June, 1920; and no. 217: 655-657, Oct., 1920. (All in Japanese.) 



Glomerella Cinnamomi Yoshino sp. nov. in Shokubutsugaku 

 Zasshi (Bot. Mag.) Tokyo, 21 248 : 230-232, PI. 5. M. 40, ix, 

 Sept., 1907. (Japanese.) 



Mycelia first colorless, later fulvous, hyphae mostly colored in 



