PLATE i6 
Helminthosporium ravenelii 
A. —Inflorescence of Sporobolus indicus, the lighter portions healthy, the darker 
portions covered with the conidial fructifications of H. ravenelii. X;^- Drawn from 
material collected at Wauchula, Florida, April 15, 1921. 
B. —Conidiophores of H. ravenelii, showing origin from interwoven hyphae on super¬ 
ficial layers of floral parts of host, crowded condition, branching habit, irregularity 
in diameter, and scars marking points of attachment of spores. X500. 
Ca-q.—Conidia showing variation in shape, size, and septation. X500. 
Da-e.—Conidia germinating in water by production of one or more, typically two, 
polar germ tubes, one from each end cell. X500. 
