Formation of Teleutospores of Ustilaginee. 67 
crease in length and breadth, so that the pyriform swellings 
become spheres, from 2 to 3 across, attached to the hypha 
by thin stems about Im thick. These become differentiated ; 
their contents vacuolated and oleaginous, and the con- 
necting branches speedily wither (Plate VI. Figs. 5, 6). 
The epispore subsequently darkens and becomes uneven, 
while to many ripe spores the remains of the spore-forming 
hyphz continue attached. 
In 7. strvieformis the process is very similar, but the 
spore-forming hyphe are larger and more gelatinized, and 
invest the spores to their maturity, after which they dis- 
appear without leaving any trace. 
Doassansia.*—The mycelial hyphe in the tissues of 
the host-plant give off branches, which at certain points 
become interlaced into tangled knots. From these knots 
are formed the spores; the central portions forming the 
true spores, while the external develop into a 
layer of oblong or wedge-shaped sterile cells, 
which constitute an investing peridium. The 
peridial cells are darker in colour than the 
spores (Plate VIII. Fig. 4). 
Entyloma—tThe spore-formation in Enty- 
loma is very similar to that of Tilletia. De 
Bary t investigated it in E. mzcrosporum and 
calendule. The much-branched mycelium is 
principally intracellular. At certain places 
blister-like swellings appear along the spore- 
forming hyphz, and also at their ends. The ,,¥i8: 572" 
Hers : 1 f 
contents of these swellings become differen- ine’ scbutospores 
tiated into spores, so that they are intercalated foming.bpha 
3 ; e Bary. 
in the hyphe (Fig. 5). Often a series of : 
spores, formed one behind the other, may be seen still con- 
* Cornu, Ann. des Science Nat., 6° sér., Bot., tome xv. p. 280, ef seg. 
“+ De Bary, Bot. Zeitung (1874), pp. 81-93; pp. 97-108, t. ii, 
