14 



Tremellaceae : Basidia globose or subglobose. longitudinally divided usually 

 into four cells, sometimes simple ; basidia in one genus in chains. Gelatin- 

 ous plants with lamellate, porous, reticulate, or toothed hymenium, and 

 continuous basidia may be sought here. 



Auriculariaceae : Basidia elongate or fusoid, transversely septate or bearing nu- 

 merous spores. 



Fam. VI, Auriculariaceae. 



Key to the genera of the Auriculariaceae. 



Ai) Plants compact, various in form, standing out from the substratum irreg- 

 ularly ; or effused or reflexed. 

 a) Hymenium reticulate or ribbed. 



AURICULARIA. Plants coriaceous, stereoid, effused, reflexed, with a gelatine us 

 hymenium. 

 aa) Hymenium even or verruciform, not reticulate or ribbed, 

 b) Entirely effused, spreading over the substratum. 



PLATYGLOEA. Verruciform, effused, thin, erumpent or superficial, gelatinous, 

 homogeneous. 



Helicogloea. Effuse, homogeneous ; basidia flexuous, incurved, bearing many 

 sterigmata on the convex part. (XI, 145). 



bb) Plants standing out from the substratum, often cup-shaped or ear- 

 shaped. 



HIRNEOLA. Gelatinous, cartilaginous, drying coriaceous-horny ; often cup- 

 shaped or earshaped ; hymenium smooth or plicate. 



Mylittopsis. Plants tuberculiform; composed of radiating fibres; basidia inter- 

 mingled with paraphyses. 



A^) Plants of loosely interwoven threads, effused. 



Stypinella. Floccose, collapsing, mould-like (like Hypochnus but basidia trans- 

 versely septate), Hedw. Beib. XI, 1896. 



Siccoblastia. Like Stypinella (or Hypochnus) but basidia bearing numerous 

 spores. 



A') Plants pileate, pileus campanulate. 



Auriculariella. Hymenium deeply plicate-alveolate. 



Fam. VII, Tremellaceae. 



Key to the genera of the Tremellaceae. 



A') Plants of various form; hymenium not lamellate, porous, reticulate or 

 toothed. 

 B) Plants compact, not floccose, nor very thin when effuse. 



C) Hymenium not setose, 

 a) Basidia not in chains, 

 b) Basidiospores several celled, or becoming so on germination. 



