110 BOTANICAL GAZETTE [ AUGUST 
was nearly uniform at the two different times, their earlier 
appearance may be accounted for by its gradual adaptation 
0 the artificial environment. Certain cells in the mycelium 
become swollen, usually septate and dark colored, and, in many 
cases, the fusion, with a smaller, curved, mycelial branch sug- 
gests a process of fertilization, although no careful study of 
this point was undertaken. From the swollen cells numerous 
colored branches arise which twine about and conceal it. At 
these places in the mycelium perithecia are formed. 
The appearance of the colonies is quite peculiar to the spe- 
cies. The mycelium radiates from a small central point, ina — 
feathery manner, forming one or two fan-shaped expansions 
which sometimes remain quite distinct for some time, or when 
growth proceeds in several radiations they become more oF 
less united, and growth is more or less uniform. The margif 
of the colony has an even fringe of straight, nearly parallel _ 
threads. 
The colony, which is at first flesh-colored, assumes a faint 
greenish tinge, which becomes a dark olivaceous brown at the 
more central portions, while the marginal growth retains the 
buff or slightly salmon tinge. The darker central portion 1S 
surrounded by the black fruiting bodies which are tufted with ” 
gtayish mycelium. The peculiar development of pigment 1§ 
quite unlike that found in the three preceding species, or in fact 
In any species yet studied. 
In connection with the perithecia grown upon bean stems; — 
large conidial cushions were formed, surrounded with dark 
spreading hyphe arising from a stroma at the base of the 
cushion. The conidia in artificial cultures frequently become 
septate. 
Vanilla, 
An anthracnose was obtained from a vanilla plant growing 
in the conservatory which belonged to the genus Colletotrichum: — 
It appeared in small black erumpent pustules on both sides 9% — 
Gnomoniopsis? vanille Stoneman ( fig. 32); Colletotrichum one - 
