EXPLANATION OF THE FIGURES. 



PLATE XVII. 



Fig. I. Sporophore of Fames annosus on deodar showing the brown tuberculate 

 incrustation, and bracket-like active portion with white hymenium 

 below ; a, a, brown, mostly sterile portion ; b, b, recent spore-forming 

 portion. 



^. White mycelial sheets under the bark of the collar. 



,, 3. Drawing of a portion of the surface of a block of wood cut from a diseased 

 tree, showing the white areas in the wood. 



4. Tissue elements modified by the action of the parasite, a, a, cells of 

 the wood parenchyma-bearing starch ; t>, bore-holes of the hyphae with 

 a filament extending across between two ; 0, spiral cracking of the wall ; 

 d, pitted vessel with a hypha penetrating it ; *, network from the 

 crossing of two spirals, the trachea is seen with the upper wall removed 

 so that the network is made up of the spiral of the lower wall of this 

 trachea and that of the upper wall of the subjacent one ; f, dissolution 

 of the middle lamella which results in the isolation of the elements. 



5. A rhizomorph. 



(All after Butler), 



