ii8 Journal of Agricultural Research voi. xix.no. 3 



given the name of Sclerospora philippinensis , n. sp., with the diagnosis 

 as follows : 



Sclerospora philippinensis, n. sp.' 



Sclerospora Maydis, Reinking, 1918, in Philippine Jour. Sci., s. A, v. 13, no. 5, fig. 

 39, pi. 20, fig. 1-2, not Butler. 



Forming linear or irregular whitish yellow to pale spots, often entirely discoloring 

 the leaves and more or less deforming the host. 



Mycelial hyphae growing intercellularly In all parts except the root, branched, 

 slender, usually about 8 ju in diameter, but irregularly constricted and inflated, 

 haustoria simple, vesiculiform to subdigitate, small, about 8 ix long and 2 ^ in diameter. 



Conidiophores always produced in night dew and growing out of the stomata, 

 erect, 150 to 400 n long, 15 to 26 /z thick, bearing a basal cell in the lower part, dichoto- 

 mously branched two to four times above, branches robust, sterigmata conoid to 

 subulate, 10 m long, slightly curved. 



Conidia elongate ellipsoid, elongate ovoid, or rovmded cylindrical, varying in size, 

 usually 27 to 39 n long by 17 to 21 /z broad, hyaline, with thin episporium, minutely 

 granular within, slightly rounded at the apex, provided with a minute apiculusatthe 

 base, always germinating by a tube. 



Oospores not yet seen. 



Material of the type has been deposited in the pathologic collections 

 of the Bureau of Plant Industry, Washington, D. C, in the Cryptogamic 

 Herbarium at Harvard University, Cambridge, Mass., and in the herba- 

 rium of the Bureau of Science, Manila, P. I. 



So far as at present known there exist in the Orient the following 

 Sclerosporas which are of primary importance, since they cause serious 

 diseases of maize. 



Sclerospora javanica Palm, known on maize and maize -teosinte hybrids in Java, 

 Madoerah, and Sumatra. 



Sclerospora maydis (Rac.) But., known on maize and teosinte in Bengal, British 

 India. 



Sclerospora sacchari T. Miy., kno\\'n on maize, sugar cane, and teosinte in Formosa, 

 and on sugar cane in Queensland and the Fiji Islands. 



Sclerospora philippinensis, n. sp., known on maize, teosinte, and sorghum in the 

 Philippine Islands. 



All these species are very similar in their effects and show close rela- 

 tionship in structure and development. All are characterized by the 



' Sclerospora philippinensis, sp. nov. 



Maculas lineares vel irregulares, albido-flavas vel pallidas effiiciens, saepe totum folium discolorans, et 

 matricem plus minusve deformans. 



Hyphismycelicis inter cellulas in totas partes praeter radicem crescentibus, ramosis, tenuibus, plerumque 

 circa 8 m in diametrum, sed irregulariter constrictis inflatisque, cum haustoriis simplicibus, vesiculiformibus 

 subdigitatisve, minutis, circa 8 m longis et 2 m in diametrum omatis. 



Conidiophoriis semper in rore noctumo productis, e stomatibus egredientibus, erectis, 150-400 m longis, 

 1S-26M crassis, in parte inferiore cellulas basilares gerentibus, supeme 2-4 dichotomo-ramosis, ramis robustie 

 cuxa sterigmatibus conoideo-subulatis, 10 11 longis, leviter curvatis. 



Conidiis elongato-ellipsoideis, elongato-ovoideis vel rotundato-cylindraceis, variis dimensione, plerumque 

 27-39 M longis et 17-21 M latis, hyalinis, episporio tenue, intus minute granulosis, apice leviter rotundatis; 

 basi cum apiculo minute munitis, semper per tubum germinantibus. 



Oosporis nondum visis. 



Hab. in foliis, vaginis, glumis. bracteis. culmis, et infiorescentiis praecipue Zeae maydis, rarius Euch- 

 laenae luxurianlis et Andropogonis sorghi per omnes partes in insulis Philippinis. 



