162 BOTANY. 
the size and form of the spore-fruit. Some of the filaments 
of the spore-fruit become enlarged into sacs in which spores 
are developed (Fig. 88), while the others make up the sterile 
Fig. 87. Fig. 88, 
Fie. 87.-Diagrammatic vertical section of a Cup-fungus, showing position of 
the spore-sacs. 
Fia. 88._A few spore-sacs of a Cup-fungus (Peziza convexula), in various stages 
of development. a, youngest, to f, oldest. The slender filaments (paraphyses) 
belong to the sterile tissue. Magnified 550 times. 
or protective tissue. The spore-sacs grow so that all reach 
the same height, and make up the inner surface of the cup 
(Fig. 87). 
