188 
fected the spots are occasionally confluent. Usually there are only a few 
spots on a leaf. 
Etiology—The fungus gives rise to numerous aceryuli, which are dark 
brown or black, irregularly scattered, varying greatly in size (50-200 
microns). They are beset with dark brown setze. The setze are numerous, 
arising from any part of the acervulus, 1-4 septate, dark brown, sharp- 
pointed, straight or slightly curved above the base. The base is usually 
bent or curved in various ways. 
The spores are hyaline, non-septate, slightly curved averaging 4.5x25 
microns. They are borne on short, hyaline conidiophores. In some cases 
at germination a delicate septum was observed in the middle of the spore. 
This is by no means always present. 
Nomenclature—There has been, in the past, some confusion in regard 
to the limits of the genera Colletotrichum, Vermicularia, Volutella and 
Cheetostroma. This has been due, largely, to the lack of care exercised by 
investigators when species of these genera have been studied. Sections 
‘arefully made clear up generic confusion very easily. The fungus de- 
scribed above is undoubtedly a Colletotrichum since there is no pycnidium, 
the spores being borne on short conidiophores in a setose aceryulus. 
In 1899, Dr. Ralph Smith! described a leaf spot of pansy caused by a 
Colletotrichum. The type material of this fungus has been examined and 
found to differ from the Colletotrichum under discussion in the size and 
shape of the spores, the shape of the setie and the character of the spot 
produced. 
Dr. Peck? in 1878 described a leaf spot of Viola rotundifolia as follows: 
“Vermicularia concentrica Peck and Clinton n. sp. VPerithecia small, 
black, beset with straight, rigid bristles, concentrically placed on arid, 
orbicular spots; spores oblong, slightly curved, pointed at each end, color- 
less, .OUOS’-.001’ long. 
“Living leaves of Trillium erythrocarpum. Vine Valley, Clinton, July: 
“The tissues at length fall out from the affected spot, leaving apertures 
through the leaf. The perithecia are less regularly disposed near the cen- 
ter of the spots. Judge Clinton also sends a variety on the leaves of Viola 
rotundifolia in which the concentric arrangement of the perithecia is not at 
all preceptible, but I detect no other difference.” 
4 
(1) Botanical Gazette. 27: 203-204, Mar. 1899. 
(#) Report of the N. Y. State Botanist 1878. 29th Annual Report of the N. Y. State Museum 
of Natural History, pps. 47-48. 
