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1899] BRIEFER ARTICLES 469 
glumes, seldom pressing them apart by increased size. The normal 
and smutted spikelets are often so much alike in their external charac- 
ters, that when searching for smutted grains ina panicle containing 
diseased ovaries, diseased spikelets are often mistaken for normal ones. 
In many spikelets, however, the ovaries become hypertrophied and the 
two glumes are pressed apart, exposing the grayish or dark destroyed 
ovary (fig. 7, C). 
Many ovaries have been but partly destroyed. In these, parts of 
the grain still remain, while the other parts have been converted into 
amass of spores. The greater number have been entirely replaced 
by the fungus spores. In the totally destroyed grains the spore mass 
is inclosed only by the epidermis and very thin original wall of the 
Ovary, which is not firm in its texture but can be easily torn off, 
exposing the black mass beneath (fig. 7, C, 6"). The affected ovaries 
aré often more shrunken and grooved, otherwise usually of the same 
size as the normal. 
The spores are large and spherical, sometimes broadly elliptical. 
They are surrounded by a hyaline, cuticle-like envelope, 2-3 thick. 
The diameter of the spores, including this hyaline envelope, is from 26— 
: : (30H. The color of the spores varies from a deep brown to black. They 
are covered with numerous projections from the wall, giving them a 
spinous appearance. These projections extend almost through the 
hyaline cuticle-like covering. They can be seen best on the less opaque 
‘pores. On the opaque spores the projections can be seen anly a the 
periphery. These projections or spines vary in size and form in dif- 
ferent spores ; sometimes being pointed and curved, but usually more 
less blunt. The spores form one granular homogeneous mass inside 
Of the Ovaries, with here and there traces of short pieces of mycelium. 
Two sizes of this mycelium are found. First, broken pieces of brown- 
ish septate hyphe, 4-6 in diameter (fig. 2, m). Second, smaller 
Yphz, 2~3 4 in diameter, which are sometimes found attached to the 
Spores (fig. 2, e). The larger hyphz are apparently remains of the 
_ Negetative mycelium, while the smaller ones are remains of the fruiting 
_ © sporogenous hyphz 
i : ins of 
Mixed with the mature spores are also found numerous rema 
ans ; ‘ e 
mmature spores which have been arrested in their growth. Thes 
Spores are found in different stages of development. The less devel- 
: oped Ones consist only of a shrunken, hyaline cell wall with no contents, 
_ Projections, or thickenings (fig. 2, ¢, @). In the more developed ones 
