Mar. 8,1924 
Nocturnal Production of Sclerospora 
7*3 
crop, and that the spores and conidiophores can not survive desiccation 
explains why so little concerning the conidial stage has been known 
hitherto. 
When studied in a fresh condition as they form at night, the conidio¬ 
phores are found to be larger and much more elaborate and complex than 
one would have assumed from previous descriptions and illustrations— 
even approximating in luxuriance the conidiophores of the typically 
conidial species of the Orient. Nevertheless, -S. graminicola stands as 
distinct from all other species now known. Its conidiophores have cer¬ 
tain essentially characteristic features; while its conidia each develop an 
apical papilla of dehiscence, and hence germinate by emitting zoospores. 
The fugacity of the conidial stage has been overemphasized hereto¬ 
fore; for, although it is fugacious in the sense that conidiophores develop 
only for a few hours each night, yet it is distinctly persistent in that this 
development may be repeated night after night for a considerable part 
of the life of the host. 
LITERATURE CITED 
(1) Berlese, E. J. 
1898-1904. SAGGIO DI UNA MONOGRAFIA DELLE PERONOSPORACEE (1898-1903). 
In Riv. Patol. Veg., s. 2, v. 6, p. 79-110, pi. 7-10; v. 7, p. 19-37, 1898; 
, v.9,p. 1-126, illus., 1901; v. 10, p. 185-298, illus.,1904. (Reprinted.) 
(2) Butler, E. J. 
1907. SOME DISEASES OP CEREALS CAUSED BY SCLEROSPORA GRAMINICOLA. 
In Mem. Dept. Agr. India Bot. Ser., v. 2, no. 1, 24 p., 5 pi. 
( 3 ) - 
1913. THE DOWNY MILDEW OP MAIZE (SCLEROSPORA MAYDIS (RAC.) BUTL.). In 
Mem. Dept. Agr. India Bot. Ser., v. 5, no. 5, p. 275-280, pi. 8-9. 
(4) Farlow, W. G. 
1884. ADDITIONS TO THE PERONOSPOREAE OP THE UNITED STATES. In Bot. 
Gaz., V. 9, p. 37-40. 
(5) Fischer, Alfred. 
1892. phycomycetes. 505 p., illus. Leipzig. (Rabenhorst, Ludwig, kryp- 
TOGAMEN-PLORA VON DEUTSCHLAND, OESTERREICH UND DER SCHWEIZ. 
Aufl. 2, Bd. I, Abt. 4.) 
(6) Gaumann, Ernst. 
1918. UBER DIE FORMEN DER PERONOSPORA PARASITICA (PERS.) PRIES. In Beih. 
Bot. Centralbl., Bd. 35, Abt. 1, Heft 3, p. 395-533, 47 fig- Zitierte 
Literatur, p. 531-533. 
( 7 ) - 
1918. UBER DIE SPEZIALISATION DER PERONOSPORA AUP EINIGEN SCRO- 
phulariaceen. In Ann. Mycol., v. 16, p. 189-199, 6 fig. Zitierte 
Literatur, p. iqq. 
( 8 ) - 
1918. UBER DIE SPEZIALISATION DER PERONOSPORA CALOTHECA DE BARY. In 
Svensk Bot. Tidskr., Bd. 12, p. 433-445, 2 fig. Literaturverzeichnis, 
, , _ F* 44S- 
(9) Griffiths, D. 
1907. concerning some west American pungi. In Bui. Torrey Bot. Club, 
v. 34, p. 207-211. (Continued article.) 
(10) Istvanffi, G. de, and Palinkas, G. 
1913. Etudes sur lE mildiou de la vigne. In Ann. Inst. Cent. Amp 61 ologique 
Roy. Hongrois, t. 4, p. 1-122, pi. 1-9. 
(11) Ito, Seiya. 
1913. KLEINE NOTIZEN UEBER PARASITISCHE PILZE japans. In Bot. Mag. 
Tokyo, v. 27, p. 217-223. 
(12) Kulkarni, G. S. 
1913. OBSERVATIONS ON THE DOWNY MILDEW (SCLEROSPORA GRAMINICOLA 
(sacc.) schroet.) of bajri and jo war. In Mem. Dept. Agr. India 
Bot. Ser., v. 5, p. 268-273, pk 6-7. 
(13) LEE, H. A., and Medalla, M. G. 
1921. leaf stripe disease of sugar cane in the Philippines. In Science, 
n. s., v. 54, p. 274-275. 
