220 BOTANICAL GAZETTE [SEPTEMBER 
species (figs. 45, 47). In later stages it loses this decurrent 
character. 
BLEMATOGEN.—The universal veil exists from the beginning; 
its development proceeds very much as in P. flammans. At first 
its hyphae radiate from all over the surface of the basidiocarp. 
Later the growth of new elements is largely confined to the apex. 
The peripheral cells become enlarged, thick-walled, with a diminu- 
tion in protoplasmic content (fig. 52). The outer ones appear 
empty and dead. Gelatinization takes place here, as in P. flam- 
mans, but later, after the gills are well formed. Sections through 
the mature pileus show that the blematogen has a structure very 
comparable in the two species, in either case composed of a struc- 
tureless matrix in which are imbedded dead hyphae, with a general 
Hel to the p tface. At first disorganization occurs 
only ower the pileus, but in the mature plant the gelatinization 
takes place over the entire surface. 
The mature pileus in P. fammans is dry, and in P. adiposa is 
gelatinous or viscid. This difference is due to the fact that in the 
latter species the disorganization of the blematogen elements pro- 
ceeds farther than in the former, so that the walls of the hyphae 
become more gelatinous, with a greater capacity for absorbing — 
_ water. The surface of the blematogen breaks up into scales, as 
in P. fammans, but the scales are very different in character. They . : 
are not thin and fibrillose here, but in wet weather appear like 
little lumps of jelly on the surface and are easily: lost, so that 
it is not uncommon to find old fruit with the surface of ae 
the pileus nearly free from them, especially over the central 
the: ground tissue below the (sae making it loose, ee 
spaces between the hyphae. At first, snes sof hyphae span the 
to the hymenophore , but these have all 
