98 BOTANICAL GAZETTE | AUGUST 
in colonies produced from conidia, which have for some time 
become adapted to artificial culture. 
On sterilized stems the fruiting stools are formed similar to 
those found on the leaves but of a more vigorous habit. The 
sete attain a length of 320”. From the acervuli the conidia 
exude in dull pink masses. 
The early growth characters and the development of the 
pigment show a close relationship with that of the Volutella 
of carnations described by Professor Atkinson. The colonies, 
however, of the latter show in photograph more decidedly stel- 
late characters in the mature colonies, while in the former the 
stroma and setz are black, instead of hyaline as in that species. 
VERMICULARIA CIRCINANS Berk. ( fig. 76). 
The anthracnose of onions, which occurs quite frequently on 
the white varieties, was first described by Mr. M. J. Berkeley.” 
An account was subsequently given of the same disease by Dr. 
Thaxter.*3 The disease first appears as a small black dot, usu- 
ally on the outer scales, which becomes encircled by rings: 
These concentric markings are caused by the acervuli, which as 
the disease Spreads are scattered with less regularity over the 
scale. The pustules are plentifully supplied with sete, and the 
conidia ooze out in dull flesh colored masses. They are ellipt- 
cal, slightly curved, or inequilateral, measuring 20—22 X 34- 
A section reveals a remarkable development of a stroma 
extending down into the tissue to a distance of 250-3004- boa! 
development extends above the tissue to some extent. There 
is not, however, a perithecium developed, and although the i 
gus has been placed among the Sphzropsidex, the.charactet of 
the pustule shows a close resemblance to those species of Colle- 
totrichum in which an abundant basal stroma is developed, while 
the marginal sete and the elevated basidia, as well as the char- 
acters in artificial cultures, intimately associate the fungus with o 
the genus Volutella. 
* Gardener’s Chronicle yz 2595. 1851. 
*8Conn. Agr. Exp. Sta. Rep. 13: 163. 1889. 
