46 E. J. BUTLER. 
cultures, but it almost certainly does so in nature on the bark of the 
host plant. I have not been any more successful in the prolonged 
cultures of Neocosmospora on a large variety of media in obtaining 
conidial stromata. Such stromatic beds are common on the bark 
of wilted plants and some, at least, would appear to belong to the 
parasite. 
The Fusarium conidia are formed in a manner quite like that 
of the microconidia, except that the spores successively abjuncted 
from the apex of the conidiophore, drop off at once, and are not 
bound in a drop of water into a head. They are falcate or more 
rarely nearly straight, with pointed ends, 3 to 5-septate, slightly 
swollen between the septa and measure 30 to 50 by 3 to 5u. 
In several cultures, particularly on potato, a second type of 
Fusarium spore developed. This was nearly as long as the first 
but much narrower and produced on whorled conidiophores resem- 
bling the clustered type often found in the microconidial stage. 
Both micro- and macroconidia germinate readily in water, 
putting out one or more germ tubes, which may grow out into a 
mycelium or may be of limited growth and give rise to secondary 
spores, usually of the microconidial type, but sometimes of the 
other. Several of those figured in fig. 7, plate IV, arose from the 
germ hyphe of the microconidia figured in fig. 6 of the same plate. 
Chlamydospores are found on the mycelium within the vessels 
and also develop in culture. They are usually round or oval 
swellings of a hypha, either at the end or in its length, and are some- 
times in short chains of two or three. The wall is thick but not, so 
far as seen, coloured, in this differmg from the similar bodies of 
several of the common soil Fusaria. In old cultures portions of the 
mycelium may become segmented into thick-walled, irregular cells, 
which appear to be of the same nature as chlamydospores. 
The above description is not sufficient to separate this species 
from conidial stages of more than one species of common soil fungi. 
In comparing it with conidial stages of Neocosmospora vasinfecta 
the only character which appears to be of diagnostic value is the 
