216 BOTANICAL GAZETTE [SEPTEMBER 
it radiates from all parts of the surface as a loose aggregation 
of hyphae with numerous interhyphal spaces (fig. 29). The new 
elements arise chiefly in the apex of the young fruit body and extend 
outward in a radial direction, curving backward as the fundament 
of the basidiocarp elongates and as the stem and pileus primordia 
are differentiated. This peculiarity of the blematogen is like that in 
P. squarrosa. This downward growth continues until a thick cover- 
ing is joumied (fig. $1). The elements of the blematogen are thick- 
walled hat larger than the other hyphaeoi the basidiocarp, 
but they are not caiasins globose, as in P. squarrosa. 
Early in its formation some of the threads begin to break down 
and gelatinize, and the universal veil soon becomes a gelatinous 
matrix, imbedded in which may be recognized the remnants of 
hyphae not yet disorganized. Such a condition exists in fig. 31, _ 
and a high magnification (fig. 38) shows a sharp contrast between 
the gelatinized blematogen and the cortex of the pileus at this stage. 
: very similar condition of the universal veil has been weaeis in 
see oiget ambigua by ZELLER (25). | 
The disorganization of the blematogen siosciente does not go 
beyond the degree shown in fig. 38. Sections perpendicular to the 
_ pileus in mature specimens show a very similar condition; there 
is a gelatinous ground substance filled with dead hyphae whose 
general course is parallel to the surface of the pileus. —— oe 
sislonee rose part and the tension. exerted upon it by the 
ig pileus the blematogen breaks up into scales. These 
: POR differ very markedly, however, from the stout, pointed ~ 
scales of P. enemibees’ bad ie thin ¢ and aetente Je » more — 
a iw FR er 
wo id ‘ f P. a. 
squares < 
J & biidt UL ! 
e ring n € stem, as indicated i in - 2 - 
epo’s Sylloge (23), in whic 
=“) eae plant : : ; 
