Murrill; Polvporaceae of North America 471 



surface smooth or tessellated, margin thin ; context thin, white, 

 fibrous, fleshy to tough, usually fragile when dry; hymenium of 

 radiating rows of large, thin-walled, hexagonal tubes, usually 

 radially elongated ; spores smooth, hyaline. 



Species: H. alveolaris (DC.) Murr., H, micropora Murr., H. 



daedalea (Link) I\Iurr., H, Wilsonii Murr., //. hispidiila (B. & C.) 



Murr., H.princeps (B. & C.) Mum, H. fragilis Murr., H. flori- 



dana Murr., H. tessellatida Murr., H, capcrata (Pat.) Murr., H, 



bmnncola (B. & C.) Murr., FL ptirpiirascens (B. & C.) Murr., //. 



portoricensis Murr., H. hondtirensis Mum, H, indurata (Berk.) 



Murr.. H. cttaillata (Mont.) Mum, H, Taxodii Mum [See Bull. 



Torrey Club 31 : 325-333. 1904 



2. FAVOLUS Beauv. Fl. Ovvar. i : i. //. /. 1805 



Type : Favohis Jnrtus Beauv. 



^rr;//V//?/;// Kuntze, Rev. Gen. 515. 189,3. Type: Favolus Jurtns 



Beauv. 



Hymenophore small, annual, epixylous, sessile, dimidiate or 

 rcniform ; surface multizonate, margin thin ; context thin, leath- 

 ery, pallid or brown; tubes alveolar; spores smooth, hyaline. 



Species : F. tennis (Hook.) Murr., F. varicgatiis (Berk.) Mum 



[Sec Bull. Torrey Club 32 : 99-103. 1905.] The first species 



is usually white xw substance, the other brown. 



3. Irpiciporus gen. nov. 



Irp 



Hymenophore annual, epixylous, sessile, effused-reflexed, 

 white or pallid throughout ; surface anoderm, glabrous or velvety, 

 not distinctly zonate, margin acute ; context white, coriaceous or 

 corky; hymenium hydnoid or irpiciform with traces of shallow 

 obsolete tubes near the margin ; spores smooth, hyaline. 



Hyuopsis of the I^ortli American species 



Teeth a centimeter or more in length ; pileus often large and thick. /. mollh. 

 Teeth one-half a centimeter or less in length ; pileus thin and shortly reflexed. 



/. Tulipiferae. 



Irpiciporus mollis (B. & C.) 



Fpcx mollis B. & C Hook. Jour. Bot. 1 : 216. 1849. 

 Irpcx crassns B. & C. Hook. Jour.* Bot. i : 236. 1849; 



Described under the former name from Raveners collections 

 in South Carohna and under the latter lower down on the same 



