PLATE 69 
A. —Conidium of Helicosporium nymphaearum (isolation 205) from culture Z'A 
months old showing germination in com-meal-agar petri dish after 12 hours, X242. 
Photomicrographed by J. F. Brewer. 
B. —Cross section through conidium of H. nymphaearum showing thin spot or per¬ 
foration in cross wall and surface sculpturings on outer wall. X900. Photomicro¬ 
graphed by J. F. Brewer. 
C. —Gonidial group ( H. nymphaearum) in situ in petri-dish culture of corn-meal 
agar at 2 weeks. X107. Photomicrographed by J. F. Brewer. 
D. —Conidia of H. nymphaearum showing attachment to sporophore and sculp- 
turings on the outer walls. X285. Photomicrographed by J. F. Brewer. 
E. —Conidial group ( H . nymphaearum) in com-meal-agar petri-dish culture at 13 
days. X107. Photomicrographed by J. F. Brewer. 
F. —Water mount of conidia of H . nymphaearum from a com-meal-agar petri-dish 
culture 13 days old, showing echinulate sculpturings on outer spore walls. X828. 
Photomicrographed with oil-immersion lens by Dr. Erwin F. Smith. 
G. —Conidia of H. nymphaearum from com-meal-agar culture showing sculpturings 
on outer spore walls. X285. Photomicrographed by J. F. Brewer. 
