LEPIOTA CEPAESTIPES 



15 



develop independently of each other so far as the arrangement of the 

 elements is concerned. The manner in which any single chess-board 

 arrangement is brought into existence requires further investigation. 

 The basidia are produced in a series of four successive genera- 

 tions (Fig. 9). For one and the same generation, the basidia are 

 about equally protuberant : but for the different generations, the 

 average degree of protuberancy is strikingly different. The first- 

 generation basidia are the longest and project farthest above the 



Fig. 8. — Lepiota cepaestipes. Surface view of the hymenium 

 equal to about one-third of a square mm., drawn with the 

 camera lucida, to show positions of paraphyses and basidia. 

 There is a tendency for the mosaic -work to be arranged 

 rectiUnearly on certain areas, as is indicated by the shading. 

 Such areas are : abed, defg,hij,ijklmf,kl n. There 

 are irregularities in the .shapes of the paraphyses where the 

 areas join. Magnification, 350. 



general surface of the hymenium. The fourth-generation basidia 

 are the shortest and scarcely project at all. The second-generation 

 and third-generation basidia form steps between the first and 

 fourth. The first-generation and second-generation basidia differ 

 least in protuberancy. 



A stage in the development of the hymenium is shown in Fig. 10. 

 Here it will be seen that the longest basidia, b b, have full-grown 

 spores, that the intermediate basidia, c c, are still developing their 

 spores, and that the shortest basidia, d d, have not yet developed 

 even sterigmata. It is evident that, while the different generations 

 of basidia are developing at the same time, the mid-basidia are a 



