Germination of Teleutospores of Ustilaginee. 97 
same time. The promycelium emerges through a small 
~ round opening in the epispore, its length corresponding to 
the size of the spore. On the upper, free, blunt end of 
the promycelium from four to eight protuberances appear, 
which elongate themselves into branches and become the 
cylindrico-fusiform promycelial spores. After all the pro- 
toplasm from the interior of the teleutospores has been 
passed into the upper end of the promycelium and into the 
developing promycelial spores, a septum is formed close to 
its upper end. If the promycelium happen to be a very 
Jong one, two or more septa occur. The promycelial 
spores, while still attached to the promycelium, become 
united in pairs by a bridge-like connection. This conjuga~- 
tion takes place at the bases of the promycelial spores, 
and but rarely at their summits. One of the conjugated 
spores then buds out a secondary spore, which in its turn 
sometimes produces a tertiary ; sometimes all these may 
be observed in achain. If there be an odd spore on the 
promycelium which has not conjugated, it does not bud. 
Conzdia.*—These are produced from a mycelial mesh 
that exists for the most part just beneath the epidermal 
structures, and is provided with very numerous botry- 
form haustorie (Plate VI. Fig. 1). The conidiophores 
emerge through the stomata, or between the epidermal 
cells (Plate VIII. Fig. 1). The conidia are borne almost 
horizontally; they are from 11 to 15m long, and consist of 
subpyriform cells attached by their larger end. A thin 
hyaline membrane encloses the granular protoplasm, in 
which a small vacuole may be observed. When placed in 
a damp atmosphere the vacuole enlarges and a germ-tube 
is produced, generally from the larger end of the conidium ; 
into this germ-tube the protoplasmic contents of the coni- 
dium are received and passed onwards as it elongates 
* Woronin, oc. cit. 
H 
