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STEREUM. Plants leathery or woody ; pileate ; central stemmed or lateral, or 

 effuse-reflexed, or entirely resupinate : free portion of pileus more or less 

 hairy or strigose ; hymenium arising from a compact layer which is separ- 

 ated from the substratum by a floccose or strigose layer of mycelium. 



CONIOPHORA. Plants membranaceous, resupinate ; hymenium fleshy but at 

 maturity dusted with the smooth, colored spores. 



Skepperia. Lateral stipe abruptly expanding into a flattened, convolute or mitri- 

 torm pileus (Cystidia in the hymenium and perhaps should go in the 

 following section). 



DD) Hymenium provided with minute spines or hairs intermingled with 

 the basidia. 

 HYMENOCHAETE. Like Stereum, but hymenium velvety from smooth colored 



bristles. 

 Hymenochaetella. 



PENIOPHORA. Plants entirely resupinate; cystidia colorless, minutely verrucose 

 at the apex. 



Bonia. Resupinate, leathery, papery, hymenium with numerous, short multisep- 

 tate bristles. 



CC) Plants with the hymenium formed of basidia at first globose and 

 simple but becoming cylindrical and transversely septate. 

 SEPTOBASIDIUM. Pileus effuse, resupinate, leathery (resembles Thelephora but 

 the basidia are Hke those of the Auriculariaceae). 

 BB) Plants floccose, erect, hymenium not well formed. 

 rOMENTELLA. (Synonymous with certain species of Thelephora where species 

 Should be sought ; separated because no well defined hymenium). 



Matruchotia. Plants dendroid, branching, formed of fasciculate hyphae, basidia 

 clavate, bearing two sterigmata (XI, 118). 



A*) Plants subgelatinous when fresh, encrusting various substances. 



Soppittiella. Hymenium even ; spores warted or echinulate, colored. (Genus 



based on certain species of the old Thelephora where they should be sought; 



see Massee, 1, 106). 



Aldridgea. Resupinate, effused, drying cartilaginous or rigid and collapsing ; 



spores continuous, colored, smooth. (See Massee I, 106). 

 A") Plants with the hymenium arising from a thin layer of mycelium which is 

 not separated from the substratum by a strigose or floccose layer; 

 plants resupinate, or margin reflexed. 

 a) Spores continuous, 

 b) Hymenium beset with cystidia or spines. 

 PENIOPHORA. Plants entirely resupinate; cystidia colorless, minutely verrucu- 

 lose at the apex. (Certain species should be sought in Corticium). 

 bb) Hymenium smooth, i. e., no spines or cystidia. 

 c) Basidia rotund. 



TULASNEA. Like Corticium but basidia globose. (See Corticium for species), 

 cc) Basidia not rotund, but clavate, or cylindrical. 



