546 



CLASS BASIDIOMYCETEAE 



Fig. 178. Phallales, Family Phallaceae. Didyophora indusiata (Pers.) Fisch. (A) 

 Vertical sections through two unexpanded eggs, the lower one further advanced. 

 (B) Vertical section through an expanded spore fruit whose indusium has not yet 

 expanded. (G) Gelatinous layer of volva. {H) Pileus. (/) Indusium. {Sw) Wall of 

 stalk. {S) Stalk axis becoming the hollow at maturity. (P) Primordial tissue between 

 stalk and indusium. {Pi) Primordial tissue between pileus and indusium. (a) Gleba. 

 (After Fischer: Ann. Jardin Botan. Buitenzorg, Serie I, 6:1-51.) 



Order Sclerodermatales (Plectobasidiales). These were set apart from 

 the Hymenogastrales by Schroeter (1897) and recognized by Fischer 

 (1933, 1936). The distinction is based upon the structure of the gleba 

 which mostly does not exhibit sharply defined hymenial cavities lined by 

 an even layer of basidia as is typical of most Gasteromyceteae. Even in 

 this order a tendency toward chamber formation is apparent in the younger 

 basidiocarps but the hyphae whose terminal cells are destined to become 

 basidia grow out into these incipient cavities to different lengths so that 

 they are more or less completely obliterated, being represented by nests 



