POLYPOREAE OF SOUTH AFRICA. 253 



1. Sporophores typically pileate, though several are also more or 



less resupinate at times. 



2. Hymenophore gelatinous and separable from context as an 



elastic membrane when moist. (Vide P. conehoides, p. 258 

 and J', dichrous, p. 257.) 



Glceoporits. Here included in Polyporus. 



2. Hymenophore not gelatinous and not separable from context in 



a distinct layer as above. 



3. Sporophores small, moie or less gelatinous throughout, laterally 



stipitate, epixylous. Laschia, p. 292. 



3. Sporophores leathery, corky or woody, never gelatinous. 



4. Hymenophore poroid, in some tending to labyrinthiform or 



daedaloid. 



5. Pores medium size, round or angular, and if angular, irregular. 

 8. Tubes forming a well marked stratum all sunk to equal depths 



in the context. 



6. Pileus annual, with a single porelayer, sessile or stipitate, epixy- 



lous or terrestrial. Polyporus, p. 251. 



6. Pileus perennial, producing a new layer of tubes each season, 



sessile, epixylous. Pomes, p. 272. 



8. Tubes not forming a well-marked stratum, sunk to different 

 depths in context; pileus epixvlous, sessile, annual or 

 perennial. Trametes, p. 279. 



5. Pores large, angular. 



7. Pileus epixylous, laterally stipitate, pores angular, radially 



elongated. Favohts, p. 291. 



7. Pileus epixylous, sessile, pores large, round to hexagonal (the 

 small-pored Hex. tenuis and its allies are distinguished 

 from Polyporus by the pores being angular and regular. 



Hexagona, p. 289. 



4. Hymenophore typically labyrinthiform (daedaloid) in part at 

 least, in some poroid at first; pileus sessile, epixylous. 



Daedal ia, p. 286. 



4. Hymenophore typically lamellate, in part at least( in L. trabea 

 usually poroid) pileus epixylous, sessile (in L. repanda 

 substipitate) . Lenzites, p. 287. 



Keys to and Descriptions of the Species. 

 Poeyporus (Mich) Fries. 



Plants annual or sometimes persisting a few seasons, epixylous 

 or terrestrial; pileus sessile or stipitate, small or of large size, 

 some brightly coloured, a few possessing a laccate surface; context 

 white, red, yellow or brown ; tubes in a single layer and sunk into 

 context tissue to equal depths so that their bases form a continuous 

 straight line; mouths circular or angular, varying in size, rarely 

 showing a daedaloid or favoloid tendency; spores hyaline or 

 coloured, in a few truncate; setae absent or present, usually con- 

 fined to hymenium and very rarely occurring in the pore-walls or 

 context tissue ; stipe when present varying from central to excentric 

 or lateral, in P. sacer it arises from a sclerotium and in P. arenoso- 

 basus from a false sclerotium. 



