245 Benzoquinones 



The air-dried fruiting body of P. rutilans contains 23%. 

 It is not produced by the fungal mycelium in artificial 

 culture. 



Robert L. Frank, George R. Clark and James N. Coker, 

 J. Am. Chem. Soc. 72 1824 (1950). 



Polyporic acid is probably identical with the lichen pig- 

 ment, orygmaeic acid, first described by Zopf. 



Wilhelm Zopf, Ann. 317 124 (1901). 



505 Atromentin, CjsHioOe, bronze leaflets, no m.p. 



HO A , „ 



OH 



Paxillus atromentosus (Batsch.) Fr. 



This basidiomycete often grows on old tree trunks and 

 produces the pigment first in a leuco-form, which air- 

 oxidizes to the colored form on the outer portions of the 

 fruiting body and during isolation. The yield was about 

 2% of the weight of the air-dried fruiting body. 



Fritz Kogl, Ann. 465 243 (1928). 



506 Leucomelone, CigHiaOj, brown leaflets, m.p. 320° (dec). 



HO HO II /\ 



Polyporus leucomelas Pers. ex Fr. 

 Yield 3 g. per kilogram of fruiting body. 

 Masuo Akagi, /. Pharm. Soc. Japan 62 129 (1942). Syn- 

 thesis) 



507 Thelephoric Acid, C20H12O9, lustrous, nearly black prisms, no 

 m.p. 



OH 

 HO- 



