LYCOPERDACEAE— HYMENOGASTRACEAE 119 



x. Peridium clavate, splitting above and entirely disappearing 



Favillea 7: 146 

 y. Peridium globoid, not entirely disappearing 



(x) Stipe hollow; peridium dehiscing irregularly, or rimose 



Phellorina 7: 145 

 (y) Stipe not hollow 

 m. Peridium many-lobed ; stipe fibrous-woody 



Xylopodium 7:143 

 n. Peridium reticulately dehiscent ; stipe solid 



Areolaria 7: 144 

 2. Gleba containing numerous sporangioles 



a. Sporangioles fleshy or gelatinous 



(1) Peridium stipitate ; stipe with persistent cupulate volva 



Dictyocephalus 17:238 



(2) Peridium not volvate, sessile or with stipe-like base 



(a) Parasitic in glumes; peridium not dehiscent 



Testicularia 7:150 



(b) Terrestrial or parasitic on roots 



x. Peridium with sterile stipe-like base, mucose-cellular within 



Polysaccum 7: 146 



y. Peridium sessile, fleshy-cellular within 



Polygaster 7: 146 



b. Sporangioles membranous, not fleshy or gelatinous 



(1) Peridium corky; sporangioles round 



Arachnium 7: 150 



(2) Peridium membranous ; sporangioles cylindric, gyrose 



Scoleciocarpus 7:151 



(3) Peridium hard; sporangioles large, flexuous 



Paurocotylis 7: 152 



Family 68. HYMENOGASTRACEAE 



7:154, 9:280, 11:168, 14:267, 16:245, 17:239 



Typically subterranean, very rarely epigaeous, mycelium often persistent; peridi- 

 um not opening at maturity, wall occasionally lacking, more or less globose; gleba 

 fleshy or gelatinous, putrescent, more or less cellular or loculate, capillitium none. 



I. Peridium wall present, distinct 



1. Peridium easily separating from the gleba 



a. Peridium volvate 



(1) Peridium silky, reticulate-sulcate ; volva gelatinous 



Clathrogaster 16:250 



(2) Peridium waxy-gelatinous, not sulcate 



Torrendia 17:241 



b. Peridium not volvate 



(1) Peridium vertical, elongate-cylindric ; basidia 2-spored 



Protoglossum 11:158 



(2) Peridium more or less globose 



