ATKINSON: LEPIOTA CRISTATA AND L. SEMINUDA 219 



the origin of the lamellae is very clear. Another feature which 

 adds to the clear and easy interpretation of the origin of the lamellae 

 is found in the broad and distant primary salients, as well as in the 

 proportionally broad sterile zone between the gills and stem. 

 The lamellae arise as downward growing salients of the level 

 palisade area of the hymenophore. In the basidiocarp repre- 

 sented in FIGURES 27-31, very slight but broad salients had begun 

 to form on one side, while on the other side the hymenophore was 

 still in the level palisade stage. In figures 2^] and 28 there is 

 no evidence of the downward folding or growth of the palisade 

 layer to form the young lamellae. On the other side of the 

 hymenophore, shown in figures 30 and 31, there are slight, but 

 distant downward folds of the palisade area. In figure 29 

 there is scarcely any evidence of such downward growth, unless 

 it be at the right hand in the middle of the arched hymenophore. 

 This longitudinal section just passes through the surface of the 

 stem at the angle of junction of the pileus and stem. Figure 30 

 is from a section farther from the stem, with slightly greater 

 magnification. At the right there is a single broad salient, much 

 more marked than the very slight fold at its posterior end shown 

 in figure 26. Figure 31 is from a section still farther from the 

 stem. Here are shown four broad salients, the strong one at the 

 right being a section of the same gill fundament as the one in 

 figure 30. The other three are much lower salients and repre- 

 sent the earliest downward grow^th of the level palisade to form 

 the gill salients. 



Figures 32-36 represent sections of a slightly older basidio- 

 carp, selected from a series passing from the middle of the stem 

 and pileus to the margin of the pileus, all parallel with the axis of 

 the stem. Figure 33 at some distance from the stem shows four 

 strong salients, and one low one of a secondary gill at the left. 

 At the extreme right and left the hymenophore is still in the 

 primordial stage. Figure 34 is stilj nearer the margin of the 

 pileus, where the two low salients are younger stages of the two 

 middle ones shown in figure 33. Figure 35 is still nearer the 

 margin of the pileus and these two salients are still younger and 

 lower, while in figure 36, yet nearer the pileus margin, there is 

 only a very slight suggestion of two low and broad folds of the 

 level palisade. On either side the hymenophore is still in the 

 primordial stage. 



