236 
A. W. BLIZZARD 
Plate VII 
Figs. 18-30. Omphalia chrysophylla. 
Fig. 18. A higher magnification of a portion of the apex of Fig. i. It shows 
the converging of the apical hyphae and homogeneous nature of the whole struc- 
ture. X 100. 
Fig. 19. A higher magnification of a portion of the apex of Fig. 2. The 
threads are spreading apart slightly and have increased in size. This differentiation 
marks the region of the pileus and stipe primordia. X 500. 
Figs. 20, 21. A higher magnification of a portion of the apices of Figs. 3-4, 
showing the further growth of the primordial hyphae of the pileus. They grow 
radially outward and by epinasty curve downward. X 300. 
Fig. 22. A higher magnification of the pileus margin of Fig. 8, showing the 
annular groove on the surface of which is the hymenophore primordium. This 
primordium is composed of the ends of hyphae whose origin is in the pileus and stipe 
elements. They are rich in protoplasm and stain deeply. The hyphae of the 
pileus margin by strong epinasty curve down by which the annular groove is formed. 
X 230. 
Fig. 23. A tangential section of the pileus near the stipe which shows in 
detail the structure of the palisade layer. This layer is formed by branching and 
interstitial growth of the primordial hyphae. As the cells themselves increase in 
size the layer becomes compact and even. X 300. 
Fig. 24. A tangential section of the pileus showing the beginning of a gill 
salient. The pressure within the layer is relieved by this downward folding of the 
level palisade layer. At the same time subadjacent hyphae by elongating push 
down into this fold forming the trama of the gills. X 300. 
Fig. 25. A tangential section showing a salient a little further developed. In 
this section the detail of the structure stands out so definitely that there can be 
no possible mistaking as to how the gill salient proceeds in developing. The tramal 
hyphae can be easily traced from the pileus elements above down into the palisade 
layer itself. In this way new elements are introduced in the periphery of the salient 
and also the trama of the gill is produced. X 300. 
Figs. 26, 27. Are tangential sections showing further development of the gill 
salients. The tramal hyphae are evident and the corymbose branching, by which 
new elements are added to the palisade layer of the gill, is clearly shown. X 300. 
Fig. 28. A higher magnification of a portion of the palisade layer of Fig. 27. 
The corymbose branching of the tramal hyphae and the intercalary growth of the 
elements are well shown. X 720. 
Fig. 29. A median longitudinal section which shows the structure of the pileus 
and its relation to the palisade layer between the gills. The hyphae branching in a 
corymbose manner supply elements to the palisade layer. X 230. 
Fig. 30. A high magnification of the edge of the pileus surface of Fig. 10. 
The very large and stout hyphae are well shown. The hyphae on the right side of 
the figure are interwoven and serve to produce a smooth surface. X 720. 
