FUNGI 83 



diameter. Larch canker and brown rot of fruit are caused by 

 fungi belonging to this group. The Hysteriaceae are a com- 

 paratively small group connecting the Pyrenomycetaceae with 

 the Discomycetaceae, agreeing with the former in the minute, 

 usually black fruit, which instead of being a spherical perithe- 



FIG. 14. Typical forms of asci. i, ascus of Peziza cerea, 

 containing eight spores, also two paraphyses ; 2, ascus of 

 Spkaerosoma Leveillei ; 3, Geoglossum Peckianum, the long 

 needle-shaped spores are in a bundle, paraphyses curved 

 at the tip ; 4, Ryparobius sexdccemsporus, sixteen spores in 

 an ascus ; 5, Tuber excavatum, ascus with one large spore ; 

 6, y.ignoella corticola. All figs, highly mag. 



ciuro, is elongated or star-shaped, and instead of a minute 

 mouth or pore, splits along its whole length to admit of the 

 escape of the pores. 



In the Basidiomycetes the pores are not produced in asci, 

 but are borne at the tips of specialised cells called basidia. 



