l.M 



The iiiyceliuni penetrates both ba-t and rind cau.-in;j; ;i very 

 acute rtd-rot in the wood, so that death of the tree attacked 

 rapidly follows. The (.list-ax- makes its appearance on plants 

 of all aiM-s, and in forests of sprue,* v pine causes i:aps 

 which rapidly extend in a centrifugal direction. The root- 

 and lower parts of the stem are generally the parts lir-t 

 attacked. On the roots, the parasite is ra-ily di-tiimui.-hed, 

 even in the absence of sporophoiv-. 



by the vei-y delicate white mycelial ^ -- -. - ~ j 



membranes formed between the 

 bark-scales. Destruction of the 

 \v ..... 1 becomes first evident by the 

 appearance of vertical dark lilac- 

 coloiirt-d stripes indicating the stage 

 when the parenchyma cells are _,; 



killed. At a later sta-e, the wood 

 becomes brown, and shows isolated 

 black spots with white mariiin- 

 i Pig. 282). The-e hi>t consist of p ' 

 coil- of daik mycelium surrounded i_l!;,^. . 

 by wood from which the incni-tin^ IM...-J- / Deatrnc- 



i i i i 'i" u "' >l"'" 



BUDStance lias been dissolved away, tlon showing white (cellul wit), 



.. . ... .." Mark (iiiyix-lium) i-rntr<-.-. (v. I .-.' 



leaving only eellulo.se, readily dlS- phot) 



d by tlll'lliliu blue oil 



treatment with chlor-xine-iodiiie : here too, the middle lamella.' 

 are ultimately di->olved out, so that the elements become isolated. 

 A colourless mycelium ma\ al>o In- (uund in the other p.m- 

 of the wood, both inside the elements, and extending in all 

 directions through the cell-wall, leavin- holes \\ln-rc it itself 

 ha- di.-appeared. Itissolutioii of the li-nifyiliv. substance pi'o- 

 ceede from the cell-cavity, the middle lamella remaining 

 intact till the last. The resin of the decayed \\ood passes OV61 

 into all healthy pail.- and tlous from the hark of diseased 

 Mem- as a ic-in-tlux. 



The most effective method for combating the ravages "I 

 tin- parasite i- i-'lation of infected area-. In one case which 



1 inve-li^ated iii I'.adeli, several SpOtS in llic f"ie.-l foi-mcd 



very e\ ident Martin- points, and -poiophoiv- were everywhere 

 present at the base of Mem- amongst the m- ch -j. 



-holdd he i-iii'l'i-ed bv ditclle- \\ltll \eltical -ide-. alld deep 



