214 
Mycologia 
In preparations which show no connective the explanation is 
equally simple, the primary wall adheres to the new or secondary 
wall, and takes the shape of the new cell. In some species con- 
idia are delicately granular, rough, or spinulose in particular rows 
>or cultures and not in others. There is some reason to think that 
these cases of conidia occasionally granular are due to the presence 
of this old wall which takes that form under such conditions and 
not under others. It has not been possible to define these con- 
ditions or prove the suggestion thus far. 
Shape and Measurements of Conidia 
Much weight has been frequently given to shape and measure- 
ment of conidia. Westling has based his key to species upon data 
of this kind. Examination of his descriptions shows that he has 
seen the great variation of both factors even in cultures upon 
prune-gelatine. When successive cultures upon media of de- 
cidedly different composition are compared the contrasts become 
greater still. Even upon a single medium the difficulty of deter- 
mining which of the sizes and shapes shall be taken as typical is 
noted by Westling himself, and fully appreciated by the writer 
with Westling’s own cultures and his paper in hand for verifica- 
tion upon prune-gelatine. As noted by Westling in his descrip- 
tions of species certain forms give very uniform data while others 
are variable. Among these variable forms, the conidia may be 
nearly all definitely elliptical in one culture and predominantly 
globose upon the next culture in another substratum but grown 
from these elliptical spores. 
Metulae 
Westling has measured and described carefully the branches 
bearing the conidiiferous cells or sterigmata. To these he gives 
the new name metulae. In certain species the new term is found 
significant and useful. In others, attempts to place value upon the 
study of these branches as metulae have proved difficult. A con- 
siderable number of the forms studied show present in this position 
branches of very unequal length. Occasionally the same verticil 
would contain sterigmata, metulae and a main central branch bear- 
ing another verticil of metulae above; the metulae would thus be 
