262 POLYPOREAE OF SOUTH AFRICA. 



ing firm and rigid in drying; surface pearl to lead or ash grey, 

 finely tomentose pruinose, undulating, smooth becoming scabrid 

 and fuliginous in places; context 0-5 mm. to 1-5 mm. white to dis- 

 coloured, firm, corky; tubes 0-5 mm. to 1-5 mm. long; mouths 

 irregular, angular, 4 to 5 to the mm. ; edges thin, entire, grey 

 changing to yellowish; spores hyaline, globose to oblong, 4/x diam. ; 

 hyphae 4/x to 5-5/x. 



Distribution. — Known only from around Durban where it was 

 collected on dead logs by the writer. (Type in Natal Herb. 

 P. v. d. B., No. 896.) 



21. Polyporus trichiliae, sp. n. 



Plants annual, sessile, or effused reflexed ; pileus dimidiate, 

 conchate, densely imbricate, laterally connate, 0-5 cm. to 3 cm. by 

 1 cm. to 2 cm. by 01 cm. to 0-9 cm. ; rigid and brittle when dry; 

 surface creamy white to ochraceous, finely tomentose, rugulose ; 

 context 1 mm. to 4 mm. thick, creamy white, firm, corky ; tubes 

 1 mm. to 3mm. long; mouths minute, subrotund to irregular, 5 

 to 6 to the mm. ; edges thick becoming thin, chamois coloured to 

 cinnamon; spores hyaline, smooth, ellipsoid, 5-5/x to 7/x by 3-7/x; 

 hyphae hyaline, simple 3-6/x to 4/x. 



Distribution. — Known from a single collection on Trichilia 

 emetica at Durban by the writer. (Type in Natal Herbarium. 

 P. v. d. B., No. 897.) 



22. Polyporus immaculatus, Fries. 



Pileus sessile, soft, fleshy when fresh, drying fragile, dimidiate, 

 10 cm. bv 6 cm. by 0-8 cm., somewhat decurrent at attachment: 

 surface white becoming greyi.vh m old specimens, smooth, not 

 encrusted; context 2 to 4 mm., white becoming discoloured, soft, 

 fragile and crumbling when dry; tubes pure white 1 mm. to 3 mm. 

 long; pores subrotund to irregular, 5 to 6 to the mm. ; edges entire, 

 white; spores (teste Lloyd) allantoid, cylindrical, curved, 1/x by 

 5/x ; the under surface in some specimens is irregularly cracked. 



Distribution. — Eastern Cape Forest Conservancy on Podo- 

 carpus log. 



The crumbly context combined with the entire plant being 

 white when fresh will assist in recognising this fungus. 



23. Polyporus robindophila (Murr), Lloyd. 



Pileus sessile, dimidiate, often decurrent behind; 5 cm. to 17 

 cm. by 4 cm. to 7 cm. by 0-9 cm. to 4 cm. ; surface milky white, dis- 

 coloured with age, azonate, finely pubescent; margin thick; context 

 white 0-5 mm. to 3-7 mm. soft corky; tubes 1 mm. to 5 mm. long, 

 white, becoming yellowish; mouths circular to angular, 4 to 6 to 

 the mm.; edges thick, entire, white; spores globose to pyriform, 

 hyaline, smooth, guttulate 5-5/x to 8/x diam. ; hyphae 4/x to 8/x diam. 



Distribution. — Found saprophytic on dead logs around Durban 

 by the writer. Mr. G. C. Lloyd remarks that the context is more 

 firm in my specimens than it is in the American form. 



