\n:i. \ 



365 



particularly in a damp ;nnl cold sprinu, and may prove very 

 destructive if it appears for several year> in succession. The 

 mycelium evidently perennates in pine-shoots, and pmd; 

 ii,-\\- Caeoma-patehes year after year till death of the h<>-t re-tilts. 

 It in'ows intercellnlarly especially in the rind parenchx ma. lua 

 al>o in the medullary rays of wood and Last : tin- contents 

 of the host-cells are aLsorLed Ly in. -an- of -liori lateral haustoria. 





l'i... i;i7. Co, oma Por( ';/Mi-|i.itdi (i-nl u 



cells partially absorbed or much com] > i>.-i>i.lui fi.'in win.-i. 



:ibj-iinti-ii in m: iii' >inuij.'cr with ili-lii-;ii<- will- and separal ! )iy 



iiii-inlir:iii')M- 1 HIM 11. ic. whirli .li.-upii. i! "li fi irni:it i. .n -I ' 

 I It. Il:llti k '.) 



Tlie pyenidia are produced at end of May or I.e-inninn' <>f 



Jlllle. Let Weell tile epidermal cell-Wall and the Clltielr of -ivell 



twi'j- : lii-foi'i- Lie,ikiii'4 out they may Le oliser\'ed externally 

 as li'-iht jiati-hes on the shoot. The Caeoma-p&tches di-velop 

 later in the >eeond or third layer of the rind-parenchyma 



( Ki'j. I'.Hii. In ,-ach patch the spores an- | Inced -eiially tVoni 



-hort stalls to the number of twenty or thereabout, and ultimately 



ipe alioiil -lime, \\heli the ei-ll> of the pa iv 1 1' 1 1 \ 1 1 ia and 



epidermis are ruptured. At tir-l the spore are connected 



iher Ly interniedi.ite cells which are .ifter\\ard> iL-orLcd 



(Fig. I '.' 7 i. The matuie aporee are globose, oval, 01 p"l\v.onal 



