214 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



from a section on one side of the central axis of the stem. At the 

 left a gill salient is shown cut obliquely, while at the right the 

 section is from between two adjacent lamellae. In figure 9 the 

 section is "tangential" and not far from the angle of the junction 

 of stem and pileus; since the lamellae are free from the stem, no 

 salients are present over the middle area of this section, but on 

 either side a few salients are shown which are cut nearly, but not 

 quite in a transverse direction, since they radiate outward from 

 near the stem. In figure 10, still farther away from the stem, a 

 few very low salients are present over the middle area which are 

 cut transversely, while the lamellae on either side, farther from the 

 stem, are cut obliquely, those nearer the pileus margin more so than 

 those toward the stem. In figure ii, from a section a little 

 farther from the stem, the gill salients over the middle area are 

 stronger and still more so in figure 12. The salients (figs. 

 II and 12) show^ but a slight downward extension of the level 

 palisade area. Here are the extreme "posterior" ends of the 

 lamellae, which remain as very low and more or less rudimentary 

 salients. From the extreme "posterior" ends of the lamellae they 

 increase rapidly in breadth for the mature lamellae are broader 

 at some distance from the end and then round off behind (next the 

 stem). The middle salients in figures ii and 12, at this distance 

 from the stem, are arrested in growth immediately, or ^'ery soon 

 after their downward extension from the level palisade. 



Figures 13-16 are from a similar series of sections of another 

 basidiocarp. Figure 15 is from a "tangential" section the middle 

 area of which passes through the sterile area between the stem and 

 posterior ends of the lamellae. For sake of clearness it may be 

 mentioned that in typical species of Lepiota the lamellae are free 

 from the stem, so that there is a circular sterile area of the pileus 

 between the stem and lamellae, which is of greater or lesser extent 

 in different species. Figure 16 is from a section nearer the margin 

 of the pileus. 



Organization of the bleniatogen and its union with the pileus 

 jundament. — In very young basidiocarps, as represented in 

 figures I and 2, the character of the blematogen has been de- 

 scribed above. Over the crown of the young basidiocarp and 

 external to the pileus fundament it consists of slender hyphae 

 3-6^1 in diameter. They extend in a longitudinal direction in 



