PLATE IO 1 
A. —Conidiophore and maturing conidia of Sclerospora spontanea on maize (Guam 
White Flint). Note the truncate apices of the sterigmata at a from which the conidia 
have been broken off prematurely. 2 a. m. X375. 
B. —Similar conidiophore from which the conidia recently have been thrown off. 
Note that the apices of the sterigmata from which the conidia have been thrown are 
bulged out. Now that it has functioned the content of the conidiophore begins to 
disintegrate. 3 a. m. X375. 
C. —Similar conidiophore at a later stage; the sterigmata are little altered but the 
main axis is losing its turgidity and becoming shrunken. 4 a. m. X375. 
D. —Similar conidiophore still later. The sterigmata and branches have shrunk 
together and the main axis is shriveling. 5 a. m. X375. 
E. —Similar conidiophore after being dried on the leaf during the day to a wrinkled 
mummy that is hardly recognizable as the remains of the vigorous structure of the 
preceding night. 3 p.m. X37S- 
F. —Conidiophore of S. philip pinensis on maize (Barbados Yellow Flint) which 
shows an unusual formation of hyphae similar to germ tubes from sterigmata that 
had just begun to bud out conidia. Apparently the conidiophore, having inherent 
in its protoplasm potentialities for hyphal germination, has for some reason behaved 
as a multiple conidium. 2.30 a. m. X375. 
G. —Group of S. philip pinensis conidiophores views obliquely from above, com¬ 
prising a relatively large number of young stages and completely covering the stoma; 
from maize (Barbados Yellow Flint) at 2 a. m. X375. 
H. —Similar group of conidiophores, one maturing conidia, and the others in various 
earlier stages of development, teased out from the surrounding tissue of a leaf section 
of maize (Barbados Yellow Flint) at 2 a. m. X375. 
F—Similar group of conidiophores, comprising three club-shaped conidiophore 
initials and one shriveled vestige of a conidiophore produced probably on some 
previous night, teased out from the stoma of maize (Barbados Yellow Flint) at 2.30 
a. m. X375. 
J.-—Unusual basal cell of forked structure serving as the base for two 5 . spontanea 
conidiophores from maize (Guam White Flint). 2.30 a. m. X375. 
• 1 Fhe drawings were made with the aid of a camera lticida from material which was scraped in dew from 
infected leaves at the time of maximum conidiophore production, immediately killed and fixed with 
osmic acid, stained, and mounted. 
