PLATE 7 
Helminthosporium catenarium 
A.—Leaf of Cinna arundinacea, the proximal portion healthy, the distal portion 
entirely withered as result of attack by H. catenarium. X H. 
Ba-j.—Spores of Helminthosporium catenarium from material collected on host, 
showing variation in size, shape, and septation; Ba, d, g, j, short spores, straight and 
tapering toward tip; Bh, long spore with median constriction; Bc,f, long spores show¬ 
ing constricted apical prolongation, with apical scar marking point of attachment of 
secondary spore; Be, long spore, irregular in diameter, growing out at apex to produce 
a secondary spore; Bh, primary spore with young secondary spore Bi attached at 
apex. X 500. 
Ca-c.—Spores from material collected on host, germinating in tap water by produc¬ 
tion of germ tubes from basal and apical segments. X 500. 
D.—Conidial fructification in 20-day-old corn-meal agar culture, consisting of 
sporophoric segments Daa-af, and spores Dba-bg. X 500. 
Ea-c.—Sporophores from material collected in field, emerging from stomata (epi¬ 
dermis and stomata considerably distorted as result of withering). X 500. 
