CRYPTOGAMS 



395 



small and of a dark colour, and grow singly on the inconspicuous mycelium (e.g. 

 if; Xplinfrin, and Podospord). In other cases the ' perithecia are in groups. 



H 



Flo. 338. Clavieeps purjmrea. A, Mycelial hypha with conidia ; /.', car of Kye with several rip<- 

 sclerotia ; C, a sclerotium with stmmatu : />. longitudinal section-of a fructification showing 

 numerous 'perithecia ; E, a single pi>ritlnciuiu, more highly magnifn-d : F, ascus with 'eight 

 filiform spores ; G, a ruptured ascus with vscaping ;S|H)IVS ; //. a siiij;lf siMirc. (A after 

 KREFELD ; C-H after TTI.ASNK : I! photograptie<l from nature. OFFICIAL ami I'oiso.vors.) 



embedded in a cushion- or] club-shaped, sometimes branching, mass of compact 

 mycelial hyphae having a paeudo-parenchymatoua structure. Such a fructification 

 is known as a STROMA. 



