240 
A. W. BLIZZARD 
Fig. 80. A tangential section through the pileus, showing the origin of the 
primary gills on its under surface. On either side of the down-growing salients a 
portion of the palisade layer is shown. X 20. 
Fig. 81. Transection of the pileus and stipe, showing the origin of the sec- 
ondary lamellae between the primary gills which show as "bars." X 20. 
Fig. 82. Tangential section of the pileus, showing further development of 
the gill salients. The tissue below the salients is a portion of the involuted pileus 
margin. X 20. 
Fig. 83. A higher magnification of the apex shown in Fig. 20. This shows 
the converging of the apical threads and the general homogeneous structure. 
X 100. 
Fig. 84. A longitudinal section of the pileus primordium, showing the general 
growth direction of the hyphae. X 300. 
Fig. 85. Transection of the stipe, showing the palisade layer. X 300. 
Fig. 86. A transverse section of the stipe, showing the first evidence of a 
fold in the palisade layer. X 300. 
Fig. 87. Further development of a salient represented by Fig. 86. It 
shows the apical growth by which the elements of the palisade layer are increased 
by elongation of the hyphae from the trama of the pileus. X 300. 
Fig. 88. Represents a little older stage than the preceding one. The tramal 
hyphae are shown growing down into the gill and branching; thus new elements are 
supplied to the palisade layer. X 300. 
Fig. 89. A slightly older stage, showing further development of the gill. 
X 300. 
