BASIDIOMYCETES 

 Order 17. TREMELLALES 



Killermann 103 



Pileus typically gelatinous, horny when dry, reviving v^^hen wet, sometimes 

 waxy, membranous or corious, but then with divided basidia; hymenium regularly 

 amphigenous or superior, smooth or somewhat convolute, occasionally enclosed in 

 a more or less definite peridium; basidia globose to terete, transversely or vertically 

 divided, or in one family merely terete-clavate and furcate, 1-4-sterigmate; spores 

 mostly simple occasionally septate; conidia often present with the spores. 



This order is related on the one hand to the Uredinales and Ustilaginales, and 

 on the other to the Agaricales, the septate or furcate basidia distinguishing it from 

 the latter especially. The form of the pileus often suggests that of several other 

 families, Clavariaceae, Hydnaceae, etc.; in the case of Dacryomitra it closely 

 resembles a tiny Morchella or Verpa. 



Key to Families 



A. Basidia septate 



1. Basidia transversely septate, elongate-cylindric, 



sterigmata lateral 



2. Basidia vertically or cruciately 2-4-divided, 



sterigmata terminal, usually subulate 



B. Basidia not septate, cylindric-clavate, with 2 



blunt terminal sterigmata 



Auriculariaceae p. 157 

 Tremellaceae p. 158 

 Dacryomycetaceae p. 159 



Family 67. AURICULARIACEAE 

 6:762; K 105 



Characters of the order, but the basidia transversely septate, elongate-cylindric 

 and the sterigmata terminal; hymenium enclosed in a more or less definite peridium 

 in a few genera perhaps better referred to the Gasteromycetes. 



A. Hymenium exposed, without peridium 



1. Pileus or at least the hymenium gelatinous 



a. Entire pileus gelatinous 



(1) Pileus crustose, efifuse or convex 



(a) Basidia with piriform basal cell, but no 



sterile threads inmixed 



(b) Basidia with sterile threads inmixed, but 



no piriform basal cell 



(2) Pileus large, firm, free, more or less ear- 



shaped 



b. Hymenium alone gelatinous, lower layer cori- 



ous; pileus large, free, more or less ear- 

 shaped 



2. Pileus not at all gelatinous, byssoid or corious 

 a. Pileus byssoid 



(1) Basal cell of basidia bearing a lateral sac- 



cate cell 



(2) Basidia without lateral saccate cell 



157 



Jola 14:245. K 106 

 Platygloea 6:771, K 106; 41 

 Hirneola 6:764, K 108; 41 



Auricularia 6:762, K 108; 41 



Saccoblastia 14:244; 41 

 Helicobasis 6:666, K 106 



