272 POLYPOREAE OF SOUTH AFRICA. 



brown, 1 mm. to 2 mm., fibrous, corky; tubes 1 mm. or less; 

 mouths subrotund, 5 to 6 to the mm. ; edges entire, yellowish 

 brown or dark brown; spores hyaline, elliptical, 5/x to 7ju. by 3/x to 

 3-7/x; hyphae 4/x diam. ; setae absent. 



Distribution. — Found by A. Roberts, on Eucalyptus log at 

 Steynsdorp, Transvaal. 



Distinguished from P. aratus by different context colour and 

 from P. subpictilis by being thicker, velvety tomentose, and having 

 on the average smaller and subrotund pore-mouths. The fungus 

 was originally named by Mr. C. G. Lloyd from specimens forwarded 

 him by Prof. A. Yasudu from Japan. 



49. Polyporus rusticus, Lloyd. 



Plants annual, sessile; pileus corky, firm, rigid, circular to 

 dimidiate 1-5 cm. to 4 cm. by 0-5 cm. to 2 cm. by 0-2 cm. to 0-6 cm. ; 

 surface grey, rugulose, scrupose; context 3 mm. to 4 mm. fibrous, 

 tough, corky, dark brown; margin acute, thick; tubes 1 mm. to 

 2 mm. lone:, lighter than context; mouths irregular, angular to 

 elongated, approximating 2 to 3 to the mm. elongated as much 

 as 2 mm.; edges thick, firm; spores (teste Lloyd) hyaline, cylin- 

 drical, obliquely apiculate, 3-5/x by 8/j,; setae absent; hyphae 4jm, 

 diam. 



Distribution. — Single collection from Pine stump at Klapmuts, 

 C.P. made by the writer. (Cotype in Natal Herbarium, P. v. d. B. 

 No. 387.) 



The rough scrupose surface is peculiar. The pore mouths are 

 frequently much elongated, and would suggest that the fungus 

 may possibly occur in the lenzitoid form. 



Fomes (Fr.) Gill. 



Plants epixylous, typically perennial ; pileus sessile, usually 

 woody, rarely corky, effused reflexed to applanate or ungulate, 

 rarely entirely resupinate; surface with or without a crust, often 

 rimose; context white, purple or some shade of brown, most fre- 

 quently woody, in some (Fames connatus) corky; tubes in a 

 definite layer, a new layer forming for each successive year of 

 growth, the successive layers at times separated by context tissue; 

 mouths circular or angular (never daedaloid, irpiciform, or lenzi- 

 toid), white, red, or brown; spores hyaline, or coloured, in a 

 limited number truncate; setae absent or present. 



The genus is characterised by the successive pore strata corre- 

 sponding to the years of growth of the pileus; some perennial poly- 

 pores are included in Trametes which see. 



KEY TO THE SPECIES. 



1. Context white, though darkening in old specimens, spores 

 hyaline ; setae absent. 



2. Tubes more or less concolorous with context. 



3. Pileus corky; successive layers of tubes separated by 



context tissue, mouths subrotund and glistening. 



F. connatus 1 



