ATKINSON: LEPIOTA CRISTATA AND L. SEMINUDA 227 



Figs. 13 and 14. (No. 28.) Sections of another basidiocarp, 13 median, 14 slightly 



"tangential." 



Figs. 15 and 16. "Tangential" sections of the same basidiocarp. 



Fig 17. (No. 29.) Portion of median longitudinal section of a nearly mature 

 basidiocarp (stem* at right), showing marign of pileus, which is very strongly epinastic- 

 Blematogen concrete with the surface of the pileus proper, showmg distmctly over 

 margin of pileus and extending down over the ground tissue which forms the partial 

 veil proper between margin of the pileus and stem. 



Plates 25 and 26. Lepiota seminuda 



Fig. 18. (No. 7.) Median longitudinal section, showing primordium of stem 

 and pileus surrounded by ground tissue, and blematogen on the outside. 



Fig. 19. (No. 10.) Median longitudinal section of a slightly older basidiocarp, 

 showing transsections ot the hymenophore primordium on either side with beginning 

 general annular prelamellar cavity below. Note arched section of pileus primordium 

 between the transsections of hymenophore primordium, the loose ground tissue above, 

 and the blematogen of globular cells as an external envelope of pileus and extending 

 far down over the stem. The ground tissue below pileus margin and hymenophore 

 primordium is the fundament of the partial veil proper which is covered externally by 

 a section of the blematogen. , • ,• 



Fig. 20. (No. 19.) Longitudinal "tangential" section of another basidiocarp, 

 passing through one side of the annular hymenophore primordium and the beginning 



annular gill cavity. _ , r .u 1 r. -j f 



Figs 21 and 22. More highly magnified photomicrographs ot the lett side ot 

 figure 19, showing hymenophore primordium in transsection, the ground tissue below, 

 and the blematogen outside at the left. 



Fig 23. (No. ii-i.) Median longitudinal section of a slightly older basidiocarp. 

 Pileus further organized; primordial stage of the hymenophore next the stem has changed 

 to the palisade stage, prelamellar cavity is well formed, blematogen appears as a very 

 distinct external layer. 



Fig 24. More highly magnified photomicrograph of the left side ot hgure 23 

 (stem axis, not shown, is at the right), palisade stage of hymenophore at right, pri- 

 mordial stage, and margin of pileus at left, blematogen to the extreme left, the external 

 portion not shown, partial veil proper between blematogen and giU cavity below pileus 

 margin and primordial stage of hymenophore. 



Fig 25. "Tangential" section of same basidiocarp, passing through one side of 

 annular hymenophore and gill cavity. Hymenophore above cavity, palisade stage in 

 the middle and primordial stage on either side. 



Figs. 26-31. Longitudinal median and "tangential" sections of a basidiocarp m 

 which the palisade stage of the hymenophore is just passing into the stage of the giU 

 salients Fig. 26 shows the large prelamellar gill cavity in transsection; the stem is 

 well organized with an external layer of more slender hyphae richer in protoplasm which 

 stains dark; the blematogen has separated from the pileus here and also in figures 27 

 and 28 Fig. 27 "tangential" and a little beyond the stem. The hymenophore shows 

 no evidence of gill salients. Fig. 28 nearer margin of the pileus, no gill salients on this 

 side of the hymenophore. Figs. 29-31 are from tangential sections of the other side ot 

 the pileus; fig. 29 is just in the surface of the stem at the angle of junction of stem and 

 pileus no gill salients shown near the stem since there is a sterile zone between the 

 posterior ends of the gills and stem; toward the margin of the pileus in the upper part 

 of the arched hymenophore there is the slightest evidence ot a young gill salient; hg.30. 



