\ PORUS. 



149 



but later becomes brown, ami, mi bcini: touched, deep red. The 

 -pnres an- white, ami various forms nf hair- occur aumn- the 

 basidia. Youni: -pomphnies appear as little hrnwn cushion- "ii 

 felled timber, al-o on living -tern- of pine, mid. according t<> 

 Magnus, nn \\'eyiiimitli pine. 



The di-ea-e -i-nerally makes it- first 

 appearance in roots and Inwei- part- of the 

 stem, spreading thence into higher parts, 

 hiseased \vnnd has a characteristic odour nf 

 turpentine: it has a reddish-brown colour, 

 and, as destruction proceeds, it gradually 

 -hrinks and disintegrates till it beei.mes'SO 

 soft as to be ea-ilv powdered between the 

 tinkers. AVhere broken over 3 the wnod is 

 uften covered with a thin white cnatin- "t 

 mycelium incrusted in re-in BO a- t" a]>pear 

 like chalk. 



Til.' myeelilim Jienetrates the cell-\\;dl- 



in all directions. A very characteristic 

 feature of this p;tra-ite is furnished by 

 -lirinka^e-ti>-iires in the thick walls of the 

 tiacheid- "t the -umnier-wood (Fig. 1'SU). 

 The.-e are numeroii- and run upward- frnm 

 riulit to left extending thioii-h' i he whole 

 wall to the outermost lave; They dilfer 

 from the tissiires in traclieids de-troyed by 

 /'. vaporarius, in lhat they run round the 



whole circumference of tile cell, ill-lead of 



bein- -m, ill and Bel \ertic;dl\ ab<>\e each 



other. 



Polyporus (Fomesi pinicola (Sw.) (U.S. 



America). Spoiophnrc- thick, hoof-like or 

 bracket-shaped, \\ith a smooth dark-'_'iey upper -ide and a bright 

 reil rounded mar-in. The hynieiiial la\.-i ifi -month and y.-llowi-h, 

 the -poi-e-jiowder \\hil'-. lii section ihe -porophorc- arc white. 

 The species i- fre.|uein on livin- stems !' -pruce, jiine, and lir. 

 also nn Kirch ami cheny. 



Polyporus 'Fomesi marginatus li. (1 3 Aimi; Spm-n- 



plmrcs \\iih red m.i md otherwise \cr\ like ilm-e of ih-- pre- 



.-iiei-ally much larger, and iii"i. .ded. 



I 



Ii i^ li. ,n l'..r I he I 







wall. ' 



W.lll ' 





 I hi- i 



nciti 



:it tin- 



-11,11 



