15 



EXIDIA. Plants cup-shaped, truncate, or effused, often papillose; basidiospores 



two four-celled on germinations, bearing allantoid, curved sporidiola. 

 ULOCOLLA. Plants pulvinate, gyrose; basidiospores two-celled on germination 



bearing narrow straight sporidiola. 

 Delortia. Plants tuberculiform; basidia ovate continuous, one-spored; basidio- 

 spores curved, three-celled. 



bb) Basidiospores continuous, not becoming septate on germination. 

 c) Plants monomorphic, i. e., not of two forms, 

 d) Plants tremelloid or disciform, not strictly spathulate or col- 

 umnar. 

 TREMELLA. Plants pulvinate or effuses, cerebriform, homogeneous; basidio- 



spore, sporidiola, and conidia w,hen present globose or ovoid. 

 Nematella. Like Tremella but with a solid, fleshy mucleus. 

 Femsjonia. Plants cup-shaped, compact, gelatinous, basidia globose. 

 SEBACINA. Plants effused, shghtly gelatinous, like Thelephora but basidia 

 globose; species should be sought in Thelephora. 



dd) Plants strictly spathulate or columnar. 

 Gyrocephalus. Plants spathulate, spores ovate, pyriform. 

 Hyaloria. Plants vertical, columnar, cespitose. (Hedw. XII, 1896, vol. 35). 



cc) Plants dimorphic. 

 CraterocoUa. Plants globose, or with spreading lobes ; basidiospores on the 

 termelloid form, conida in cup-shaped forms, 

 aa) Basidia in chains. 

 Sirobasidium. Plants gelatinous, pulvinate ; basidia in chains, longitudinally 

 septate, the terminal ones the older; basidiospores on any part of the 

 basjdium. 



CC) Hymenium setose. 

 Heterochaete. Plants effused, membranous-floccose or leathery, gelatinous, cov- 

 ered with setae. 

 BB) Plants floccose like Hypochnus, or very thin and encrusting. 

 Stypella. • Floccose, collapsing, mould like, basidia globose. 

 Exidiopsis. Plants very thin, encrusting, basidia globose ; conidia present and 



appendiculate. 

 A^) Plants with hymenium lamellate, porous, reticulate or toothed ; .basidia 

 may be elongate and continuous. 

 B) Hymenium lamellate. 

 HELIOMYCES. Like Marasmius but substance subgelatinous tremelloid. 

 Stylobates, plants subgelatinous, clavate-capitate, hymenium in lamellae below 

 but converging over the apex where it is venose. 

 BB) Hymenium porous or reticulate. 

 Protomerulius. Like Merulius but basidia globose, longitudinally divided into 

 four cells each giving rise to a basidiospore. 



MERULIUS. Plants waxy, tremellaceous, effuse then reflexed, context mucose- 

 fibrous ; hymenium reticulate from anastomosing veins. 



GLOEOPORUS Like Polyporus but with a gelatinous hymenium. 

 LASCHIA. Plants gelatinous-tremellaceous, drying membranaceous, faintly fove- 

 olate-reticulate. Alveoli thin, flaccid, homogeneous with the pileus. 



