g2 BOTANICAL GAZETTE [ AUGUST 
conidium at either end, which gives it the appearance of being 
constricted at the center. This agreed with the peculiarity 
observed by Professor Atkinson, as did the further development 
of the colony and the appearance on bean stems. 
In order to compare the development of the anthracnose of 
the watermelon and the bean, parallel dilution cultures were 
made of the two on March 15, in order that uniform conditions 
of growth might be obtained. The material from which the 
cultures were made was obtained from separation cultures of the 
two previously made on bean stems. On March 16 the conidia 
of Col. lagenarium had sent out germ tubes about ten times their 
length, while others were not so far advanced, being shorter 
than the conidium itself. Some of the conidia were provided 
with septa, one usually at the middle. A few of the conidia of 
Col. lindemuthianum showed short germ tubes, but many had only 
increased in size. Four days later the conidia, which had just 
begun to germinate, showed the characteristic dumb-bell swell- 
ing, and many of those which had germinated earlier were also 
seen to be considerably swollen, and many were once septate. 
From some of the conidia as many as four germ tubes had 
formed. A few which had produced germ tubes of considerable 
size showed no appreciable difference in size or shape ; whether 
a change would come later could not be determined as they 
were obscured by the mycelial growth. While the spores of 
Col. lagenarium occasionally become distended, the pronounced 
dumb-bell appearance is not a feature of germination. The 
germination of Col. lindemuthianum resembles that frequently 
observed in spores of Marsonia, which are originally septate. 
As the colonies had exhausted the nutrient medium, the enlarged 
vescicles observed in the mycelium of G. lagenarium were see? in 
G. lindemuthianum. These were larger than those previously 
mentioned; they were frequently once septate, and sometimes 
sent out one or several short tubes. oe 
Not only do these two species show distinct differences in 
early growth, but the mature colonies present a very different 
aspect. Instead of the salmon cast of the colony, it is at first 
