124 FUNGI. 
of short threads, either enclosed in a perithecium, or seated upon 
a kind of stroma. These are exceedingly variable, sometimes 
large, and multiseptate, at other times minute, resembling sper- 
matia. In such genera as are chiefly epiphytal, in Septoria, 
Phyllosticta, and their allies, the minute spores are enclosed 
within membranaceous perithecia, and when mature these are 
ejected from the orifice at the apex, or are exposed by the break- 
ing off of the upper portion of the perithecia. In Diplodia and 
Hendersonia the spores are larger, mostly coloured, often very 
fine in the latter genus, 
and multiseptate, escaping 
J from the perithecia by a 
terminal pore. -Probably 
the species are only pyc- 
‘S nidia of Spheriacei, but 
AN that is of no consequence 
in relation to our present 
inquiry. Of stylospores 
which deserve mention on 
Fic. 49.—Spore of Hen- Fic. 50.—Spores of Dilo- account of their singu- 
dersonia polycystis. phospora graminis, larity of form, we may 
note those of Dilophospora graminis, which are straight, and 
have two or three hair-like appendages at each extremity. In 
Discosia there is a single oblique bristle at each end, or at 
the side of the septate spores, whilst in Neottiospora a tuft of 
——— 
Fic. 51.—Spores of Discosia. Fig. 52.—Spore of Prosthemium betulinum. 
delicate hairs is found at one extremity only. The appendages 
in Dinemasporium are similar to those of Discosia. The spores 
