236 BOTANICAL GAZETTE. 
pearance of the galls vary with the different species, and are, 2 
a rule, characteristic. When the galls are abundant the leaves 
may be called host-cells ; but, more frequently, it is in the ad- 
joining cells. 
Once inside its host-cell the parasite increases in size and de- 
velops into a spherical or elliptical cell, which as it matures 
mes either a resting spore ora sorus In the simplest cases, 
as 8. Anemones, the cell wall thickens, and i8 composed of two 
coats, an epispore and an endospore, the former being dark, 
thick and brittle, and the latter thin and lighter colored. Gen- 
erally only one resting spore is found in a single host-cell, but 1 
sometimes happens that the cells are attacked by more than one 
parasite, and then we may have several resting spores in & cell. 
In extreme cases, as S, pluriannulatum, there are as many 28 294 
or even more, resting spores inacell. The resting spores are pro- 
duced principally towards the end of the season, and are set free 
by the rotting away of the leaves in which they are contained. 
In species like 8. papillatum, where the host-cells form bladders 
on the surface of the leaves, the cells are brittle and readily break 
off, and in this way the resting spores escape. 
.J© Spores germinate in one of two ways. In the first the 
€pispore cracks open and the endospore and its contents exude 
Sa ene idatiieaias ee a ts it eee, aasini me oie 
terion 7el°ichende Morphologie und Biologie der Pilze, Mycetozoen and Bar 
