10 



Grammothele. Plants resupinate, hymenium porose, pores reticulate and gran- 

 ular. 

 BB) Hymenium with sterile outgrowths in the form of cystidia or spines. 



Asterodon. Plants resupinate, spreading, membranaceous, teeth awl-shaped, 

 hymenium beset with stellate brown cystidia. 



KNEIFFIA. Sterile hair-like outgrowths in clusters ; fertile hymenium like 

 Corticium. 



Hydnellum. Like Kneiffia but basidiospores echinulate (based on Kneiffia subtilis, 

 Hedw. XXXV, 163, 1896. Karsten. 



Hydnochaete. Resupinate, corky-subcoriaceus ; hymenium with brown simple 

 cystidia which give plants a chestnut color. Near Asterodon but cystidia 

 not stellate. fBresadola, Hedw. XXXV, 287, 1896). 



AA) Hymenophore or subiculum absent. 



MUCRONELLA. Teeth arising directly from the substratum, awl-shaped. 



Fam. IV, Thclephoraceae. 



Key to the genera of the Thelephoraceae. 



1. Eu-Thelephoraceae ; pileus devoid of green gonidia (old plants sometimes 



have green gonidia growing on them). 

 A) Plants not gelatinous or subgelatinous, forming a prominent hymenophore 

 which stands out from the substratum, or if effuse or resupinate then 

 leathery, papery, or woody and hymenium arising from a distinct pileus 

 which is separated from the substratum by floccose or strigose layer. In 

 the pileated forms no mucus bearing cystidia on the upper sterile surface. 

 B) Plants compact ; hymenium well formed. 

 C) Basidia forming the hymenium continuous, i. e., non-septate. 

 D) Hymenium smooth, i. e., not bristling with minute spines or hairs, 

 a) Hymenium ribbed or rugulose. 

 b) Ribs of the hymenium smooth. 



CRATERELLUS. Plants fleshy or membranaceous, erect, often infundibuliform; 

 hymenium ribbed or sometimes rugulose. 



THELEPHORA. Plants leathery, erect and stiptate and lateral, or effuse-reflexed, 

 or resupinate ; hymenium sliglitiy ribbed ; spores spherical, colored, mi- 

 nutely warted or echinulate. 



b) Ribs of the hymenium covered with warty projections. 



Cladoderris. Pileus. leathery- woody; hymenium woody; ribs of the hymenium 

 branched radiating, finally covered with warts or spines. (Related to 

 Thelephora but woody). 



Beccariella. Like Cladoderris but ribs fan-shaped and covered with small verru- 

 cose or crested projections. 



aa) Hymenium even, i.e., not ribbed or rugulose. 



Hypolyssus. Plants leathery, somewhat urn-shaped; pileus hard, stuffed. (Re- 

 lated to Craterellus but pileus not infundibuliform, etc). 



