82 MISSOURI BOTANICAL GARDEN. 
branch alternately from the mycelium. These first conidia 
are borne in clusters of three types, two of which are 
simple clusters of the type of those of Sporotrichum but 
not borne on prostrate hyphae, the other being a form 
which is like most of the conidia described under Cera- 
tostomella. In this latter form the conidia are borne in 
the short branching chains. These conidia are all ephem- 
eral and do not hold their vitality as long as those which are 
produced later upon the heads or stromata. In order to 
distinguish them from the latter, they are now for the first 
time called secondary conidia; and those of the heads or 
stromata are now called primary conidia. As the colony 
grows older, some portions of the mycelium become more 
or less pigmented, and the darker filaments grow together 
in masses from which erect columns of parallel hyphae 
spring forth. These bear heads composed of branched 
hyphae, which produce the primary conidia terminally by 
abstriction. As fast as the conidia are formed they drop — 
away into a mucous matrix which forms over the surface of 
the head. . 
SECONDARY CONIDIA. 
The secondary conidia of the Sporotrichum-type are of 
two forms and are borne on simple erect or branched 
hyphae. The first form of this type are attached to the 
hyphae in spreading, open clusters, which do not fall to- 
gether in masses until some days after they mature (pl. 7, 
f.3). The second form are produced in close clusters 
which fall together as rapidly as they mature (pl. 9, f. 9). 
The third form of fruiting, as mentioned in the previous 
topic, more nearly resembles the branching chains of the 
conidia of many species of Ceratostomella (pl. 9, f. 3). 
The spores in all three forms are oval, elliptical, or cylin- 
drical, and correspond closely in form and measurement to 
the primary conidia of the same species. They are unicel- 
lular and formed by abstriction either from the terminus of 
the hyphae or from short, terminal or lateral branches. 
