PAPBRS ON BOTANY 258 
X.—HELMINTHOSPORIUM MAYAGUEZENSE Sp. NOV. 
Spots amphigenous, distinct, conspicuous, very light-brown, 
cinereous toward the center, surrounded by a narrow, dark- 
brcwn line. Spots oval in outline, varying in size from quite 
small to a centimeter in length, approximately one-half as wide 
as long. Conidiophores large, numerous, single or very rarely 
in pairs, unbranched, hollow, straight or slightly curved, rising 
usually from a point where two or more mycelial hyphae come 
together, as a rule, through a stoma, often constricted at the 
point of passage through the epidermis, expanding into a more 
or less pronounced swelling immediately above it, dark-brown 
in color, 300-500x18-22 microns. Mycelium composed of short 
irregularly shaped cells, branching quite frequently, intercellu- 
lar, light-yellow in color. Spores fusiform or clavate, 3-4 
septate, dilute-brown, borne singly, short-pedicillate, thin- 
walled, collapsing readily, 135-155x35-45 microns at the 
broadest point. 
On culms and leaves of Paspalum conjugatum, Bergius, in 
Porto Rico, Mayaguez, 970; 1066; 7124 (type) ; 8232, 8279; 
8941: Dos Bocas, 1093; San German, 5803; Afiasco, 4904; 
Maricao, 8776. 
