9 



Poroptyche. Pores in the margin, foveolate, soon becoming larger and irregu- 

 larly lobed, often closed, 

 aa) Plants not resupinate. 



Ceriomyces. Plants subglobose; hymenium on surface of closed locelli, rarely 

 tubes superficial (often found in connection with Polyporus and Daedalia 

 of which it is possibly an abnormal form). 



LENTODIUM. Like Lentinus but with radiating irregular pores (some closed) 

 instead of lamellae (possibly an abnormal form of Lentinus tigrinus). 



Henningsia. At first Uke Thelephora, finally like Polyporus. (Beib. zur Hed- 

 wig., Feb. 96, p. 9). 



Fam. ni, Hydnaceae. 



Key to the genera of the Hydnaceae. 

 A) Hymenophore or at least a subiculum present. 

 B) Hymenium not possessing sterile outgrowths in the form of hairs or 

 spines, 

 a) Teeth awl-shaped, well formed, more or less cylindrical projections, 

 plain or with a few indentations at the ends, these not forming pores. 

 (See Porothehum in Polyporaceae). 

 b) Plants gelatinous. 

 TREMELLODON. Teeth beneath, 

 bb) Plants not gelatinous. 

 HYDNUM. Plants pileate, central stemmed or lateral, or resupinate and spread- 

 ing; fleshy or corky. 

 Hericium. Plants clavate, teeth borne on the apex ; fleshy. 

 ODONTIA. Plants resupinate, subiculum of interwoven fibres bearing crested 

 warts and spines. 



CALDSIELLA. Plants composed of a membranaceous fibrillose subiculum (not 



a true pileus) ; teeth conic ; spores brown, muricate. 



aa) Teeth lamellate, i. e., on the edge of short lamellae, or folds, or tubes. 

 SISTOTREMA. Plants fleshy, hymenium below. 

 IRPEX. Plants leathery or woody (teeth concrete with pileus). 

 Lopharia. Plants resupinate, hymenium of crest-like veins or wrinkles margined 



with crested Incisions. 



aaa) " Teeth " forming irregular'shallow folds or wrinkles. 



PHLEBIA. Plants resupinate, shallow folds or wrinkles sometimes radiating, but 

 more or less irregular and interrupted. 



Thwaitsella. Plants resupinate, thin, folds radiate from the center, and anasto- 

 mose more or less ; margin smooth (do not confound with Merulius). 

 aaaa) " Teeth " forming obtuse, short, tubercles, or granules. 



RADULUM. Plants resupinate, hymenium of irregular, subcylindrical, obtuse 

 tubercles. 



GRANDINIA. Plants resupinate ; hymenium of globose or hemispherical gran- 

 ules, obtuse or indented. 



