1917] SAWYER—PHOLIOTA 223 
peripheral region, and radiate from the entire surface of the fruit 
bod : 
y. 
2. The blematogen is present from the first. differentiation of 
the fruit body primordium, and in its earliest stages consists of the 
loose, radiating peripheral hyphae. In subsequent growth it 
forms a thick layer enveloping the entire plant; in’ P. flammans 
and P. adiposa it becomes partially disorganized by gelatinization. 
3. The formation of the stem fundament is the first differentia- 
tion to take place in the young fruit body. It originates in the 
basal part of the basidiocarp and by growth and differentiation 
progresses toward the apex. 
4. The primordium of the hymenophore is differentiated around 
the apex of the stem fundament as an annular internal zone of new 
growth. Frequently, before the hymenophore appears, a slight ~ 
divergence of hyphae from the ‘acini apex indicates differentiation 
of the pileus. When theh dium is differentiated, 
it marks off clearly the limit between the pileus and stem. It 
consists of slender hyphae, rich in protoplasm, which grow down- 
ward. At first the lower surface is uneven and loose, but by con-_ 
tinued growth the hymenophore becomes compact and the hyphae 
grow down to the same level, forming an even: palisade area. ae 
ies of the spose and es aeneee! of the _— — ee 
1 I : - S ae 4 4 
i * 3 ees 
os. Th lar . ae 
of the ground tissue f irom the low f. f tk 1 e, due : 
to the tension exerted by the growth and expansion of the plant — 
parts. It is weak in P. SNGITOS, @ as wen Femeet flammans — 
oa and P. adiposa, bef As 
