256 POLYPOREAE OF SOUTH AFRICA. 



11. Context yellowish brown or brown but not olive or 

 purple. 



13. Surface of pileus distinctly pubescent. 



14. Pileus 1 mm. or less thick; surface velvety tomentose, 



umber-brown, zoned. P. phocinus 45 



14. Surface azonate, with a reddish brown velvety to villous 



or hirsuty pubescence. P- flexilis 46 



13 Surface of pileus glabrous or minutely pubescent. 



15. Pileus thin, flexible, surface with raised concentric 



zones; margin thin, crenate. P. subpictilis 47 



15. Pileus firm, surface not with raised concentric zones 



as above. 



16. Spores hyaline, globose, 3-7li diameter. P. anebus 34 

 16. Spores hyaline, elliptical, 5/x to 7/x by 3/x to 4/x. 



P. subradiatus 48 

 13. Surface of pileus very rugulose and scrupose. 



P. rusticus 49 



1. Polyporus sacer, Fries. 



Pileus orbicular 7-5 cm. to 10 cm. diain. borne on a stalk 

 centrally attached, 4 cm. to 10 cm. high by 7 mm. to 12 mm. diam., 

 which arises from a sclerotium 6-5 cm. by 3-5 cm. ; surface of 

 pileus zoned, horny-encrusted, hard, rugulose, furrowed, gieyish 

 to dark-brown, velatinate to glabrous; context 0-75 mm. to 

 1-5 mm., soft, fibrous to membranous, white to yellowish; tubes 

 2-5 mm. long, white, changing yellowish; mouths angular, 2 to the 

 mm., edges firm, entire white to yellowish; spores hyaline 9/x to 

 13jx by 6-5/x to 7-5/x ; hyphae 4/x to 5-5/x. 



Distribution. — W. Thorncroft at Barberton, Transvaal; J. M. 

 Wood at Durban, Natal; Col. Friend Addison at New Guelder- 

 land, Natal. 



Recognised by the stalked, velutinate and zoned pileus arising 

 from a sclerotium. 



2. Polyporus dictyopus, Mont. 



Pileus stipitate, thin, coriaceous, orbiculate to flabelliform, 

 depressed, 3 cm. to 4 cm. diam. by 1 mm. thick; surface black, 

 glabrous, zonate, radiallv striate; margin thin, undulate to lobed ; 

 context white to yellowish, 0-3 mm. thick; tubes 0-7 mm. long, 

 white when fresh, changing to brownish, decurrent on stipe; 

 mouths angular 4 to 6 to the mm., edges thin becoming lacerate, 

 white changing to brownish; stipe excentric, black, glabrous, about 

 7 mm. long by 5 mm. diam., spores (teste Bresadola) hyaline, 

 oblong, 7fx to 8/x by 3li to 3-5/x ; hyphae 2ji to 4/x. 



Distribution. — From collection in Natal, by J. M. Wood. 



3. Polyporus varius, Fries. 



Pileus stalked, varying in form from sub-orbicular to reniform, 

 flabelliform or spathulate, often lobed ; tough and leathery when 

 fresh, firm, hard and woody when dried, 2-4 cm. to 10-5 cm. by 

 2 cm. to 8 cm. by 3-7 cm. ; surface glabrous, radially striate and 



