15 
Colletotrichum nigrum, Ell. and Hals.—Spots one to two cen- 
timeters across, orbicular; central portion black from the abund- 
ance of black bristles, margin paler. Acervuli numerous, crowd- 
ed, erumpent, margined by a circle of long, 100-150m by 3-4 
black straight bristles. Basidia olivaceous, slender, 15-20/ long. 
Conidia cylindrical, nearly straight, hyaline, nucleate 20-22y 
by 4. 
In the engraving, upon the left is shown a pepper with the 
decaying patches, the larger and darker being the older. In the 
upper center of the engraving is seen a magnified view of a por- 
tion of the dark diseased spot with the fungus shown as rosettes, 
one of the latter being given more highly magnified below. A 
section through the same is indicated in the lower right hand 
corner and the spores are shown just above and greatly magnified. 
This black Colletotrichum must be called the Bristly or 
Black Anthracnose of the pepper because another anthracnose, 
namely: Gleosporium piperatum, E. & E., has been found during 
the present season upon the same pungent fruit. _ 
ByRON D. HALSTED. 
Rutgers College, Sept. 11, 1890. 
