226 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



Explanation of plates 21-26 



(Photographs by the author) 

 Plate 21 

 Lepiota cristata, various forms from the vicinity of Ithaca, N. Y. 



Plate 22 

 Lepiota semijiuda. Upper group from Cascadilla Woods, Campus, Cornell Uni- 

 versity (No. 5351 Cornell Univ. Herb.). Middle group, part of same magnified nearly 

 two times, showing the mealy stem and pileus. Lower group from a spruce forest in 

 the Jura Mountains, France, near Pontarlier. 



Plates 23-26 

 The magnifications of the photomicrographs are as follows: Fig. 38; 25 diameters. 

 Figs. 13, 14, 15, 16; 30 diameters. Figs. 7, 8, 9, 10, 11, 12; 35 diameters. Fig. 32; 

 42 diameters. Fig. 23; 50 diameters. Figs. I, 2, 3, 5, 17; 60 diameters. Figs. 26, 27, 

 28, 29, 31, 33, 34, 35, 36; 65 diameters. Figs. 18, 19; 80 diameters. Fig. 33; 100 

 diameters. Figs. 20, 25; 130 diameters. Fig. 11; 150 diameters. Figs. 4, 6; 160 dia- 

 meters. Fig. 21; 200 diameters. Fig. 24; 320 diameters. Fig. 22; 500 diameters. 



Plates 23 and 24. Lepiota cristata 



Fig. I. (No. 18.) A median longitudinal section of a young basidiocarp with 

 fundament of stem, as darker interior area. 



Fig. 2. (No. 16.) Median longitudinal section. Fundament of stem and pileus 

 enveloped by ground tissue, and blematogen as an external zone. 



Fig. 3. (No. 5/2-1.) Median longitudinal section. Primordium of hj'menophore 

 as two darker staining internal areas symmetrically disposed on either side above early 

 stage of the annular cavity appearing as two light areas. The pileus is further organized 

 and concrete with the blematogen, which shows as a lighter external zone. 



Fig. 4. (No. 5/2.) Longitudinal "tangential" section of same basidiocarp, passing 

 through the hymenophore primordium and annular prelamellar cavity. Note the 

 slender, loosely arranged hyphae of the hymenophore primordium projecting down into 

 the gill cavity. 



Fig. 5. (No. 9/1.) Longitudinal "tangential" section of another basidiocarp, 

 just passing out from the stem. Note the densely staining sections of the hymenophore 

 on either side and the early stage of the gill cavity below. 



Fig. 6. (No. 1-2.) Longitudinal "tangential" section of another basidiocarp pass- 

 ing through one side of the hymenophore primordium, which is the dark transverse 

 area, the slender hyphae growing down into the loose ground tissue below. The latter 

 is beginning to tear apart, forming a very early stage of the gill cavity. 



Fig. 7. (No. 6/2-1.) Median longitudinal section of older basidiocarp. The 

 young lamellae are cut nearly in a parallel direction. The blematogen shows distinctly 

 on the right hand side over the pileus and extending down past the pileus margin and 

 on the outside of the partial veil proper, the latter formed of ground tissue and some 

 growth from pileus margin. 



Fig. 8. (No. 6/1-1.) Same basidiocarp, but section slightly "tangential" and 

 through one side of the stem. Blematogen and partial veil proper, as in Fig. 7. On the 

 left a gill cut obliquely; on the right the section passes between two gills. 



Figs. 9-12. Four longitudinal "tangential" sections of the same basidiocarp 

 selected from a series showing origin of lamellae as downward growing salients into the 

 general annular gill cavity. 



