200 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE  [VOL. XII 
branched. Unbranched threads 1,000-1,500u are readily found in any 
mount, while much search is required to find branching. Next to the 
pores, however, there are areas directly opening on the pores, and separ- 
ated from one another by a matrix of the thick-walled fibres, in which 
the hyphae are much branched, septated, thinner-walled and rather 
coarser. The areolation of this region, readily seen with a hand-lens 
appears to be in continuity with a remarkable areolation that charac- 
terizes the organization of the entire context. 
Reference to figure 5 shows that there is a very evident mottling of the 
context or division into areolae, and that this extends in modified form 
into the cortex. A microscopic examination shows that this is due, not 
to irregularities of resin secretion, but to the fact that the context and 
cortex consist of compact strands of threads bound together by a loose 
and irregular net of hyphae. These strands dividing into finer ones 
pass down towards the tubes in the one direction, while near the surface 
others turn upward and running almost parallel with one another form 
the cortex. This peculiarity of organization, shared to some extent 
by species of Spongipellis though not by Polyporus sulphureus, did not 
escape the notice of Harz.1!_ Harz, indeed, examined this feature rather 
carefully, and states that if the resin be removed, it becomes plain that 
these strands form a common system, all originating from main trunks 
at the point of attachment of the sporophore to the mycelial mass in 
the host, these trunks dividing and redividing, ramifying and anasto- 
mosing throughout the context, and constituting a framework or 
skeleton of the context. 
The pore-layers retain their porosity but a single season, since the 
pores rapidly fill with hyphae, outgrowths from the surrounding tissues. 
The threads of the walls are more like those of the context, while those 
filling the pores are much branched and septated, rather larger, and 
thin-walled. But throughout branching is more frequent as would be 
expected, and is of the various types represented in Figs. 22, 24, 25. 
There are likewise not infrequent abnormalities such as gall-like swell- 
ings (Figs. 19 and 20), in which it can plainly be seen that the walls of 
of the hyphae are laminated, and, too, there are occasional threads up 
to 10u in width. The thin-walled threads are mostly from 2.5-3u in 
diameter and are characterized by distinct septa and rich cell contents. 
(Figs. 22, 24, 25). ‘ 
All the hyphae are encrusted with resin, and this resin is found 
secreted freely on the surfaces, continuously or at intervals. The resin 
granules are of two colours, white and rich golden yellow. The en- 
crustation is extensive throughout, though more or less irregular, but 
it is in the outer layers, especially the crust of the sporophore that it 
