1917] SAWYER—PHOLIOTA 219 
Pholiota adiposa 
PRIMORDIUM OF BASIDIOCARP.—In the youngest fruit body 
sectioned the mycelial threads grow out from the substratum to 
form a compact mass of hyphae which are closely interwoven and 
run in all directions. From this structure hyphae gradually assume 
-an upward direction of growth, forming a papilla-like projection 
(fig. 42), the fruit body primordium. The threads in the basal 
mycelium from which the fruit body arises are very uneven in size; 
those of the primordium are even in size, with free ends radiating 
out all over the surface. 
STEM FUNDAMENT.—The stem fundament probably differen- 
tiates first in the base of the fruit body, as in the preceding species. 
In fig. 43 its apex appears as a compact, dark-staining region near 
the top of the basidiocarp, surrounded by the looser tissue of the 
young blematogen. The fundament hyphae are very slender at 
first, dense in protoplasm, and closely . running in all 
directions. 
PRIMORDIA OF HYMENOPHORE AND PILEUS.—When the hymen- 
ophore and pileus primordia appear, the stem has become well 
organized as a compact conical area, surrounded by the loose a 
universal veil. The first differentiation of the pileusfundament be- __ 
comes evident through the growth of hyphae upward from the stem _ 
apex; these spread outward laterally, so that at this stage the : 
stem and pileus areas together resemble a sheaf of wheat. At the _ 
same time some of these hyphae Deceane. subject to strong. epinastic : 
growth, and curve down in g the 
primordium of the hymenophore, which definitely | differentiates 
‘the pileus area from the a m fundament. The gr pileus 
continues b a ie si Sa a 
ag —— broadens age by growth within 3 itself etted oo 
2 The baliee of the ijineaopnase delendtien =a 
gated ‘into. hier (fig. 48), as as in 
- - still: re | attached — these 
din tot 
