398 Transactions. 
MORPHOLOGY. 
MYCELIUM. 
When a conidium germinates it produces a small infection hypha, 
which, if conditions are favourable, penetrates the tissues of the host. There 
cells. 
Infection may occur when the host is in the seedling stage (as in Ustilago 
SPORES. 
These develop directly from the mycelium. They are usually produced 
in the inflorescences, replacing the ovules, but may also be formed within 
the tissues of the leaves and stems. From the vegetative mycelium, in 
certain restricted areas, special short hyphae are produced which are cut 
off by septa from the vegetative mycelium ; they then become somewhat 
rounded, and the outer walls become partly gelatinized. Within these 
which is colourless, contains numerous oil-globules, and a single nucleus 
in which is a large nucleolus. The epispore may be smooth, finely or 
coarsely verruculose, or retic te. 
GERMINATION, 
Spores may germinate as soon as mature, or may require a more or less 
protracted period of rest. The method of germination differs considerably 
їп different genera, and. even in different species in the same genus. 
These differences are more conveniently discussed under each genus and 
"peru ш гын however, there are two methods of germination, and 
