14 



RESEARCHES ON FUNGI 



of the hymenium frequently exhibit a fairly regular quadratic 

 arrangement of the elements. This is well shown in the camera- 

 lucida drawing reproduced in Fig. 8. Here, the paraphyses on 





Fio. 7. — Lepiota cepaestipes. Surface sections of the 

 hymenium. A, camera-lucida drawing showing : first- 

 generation basidia, a, which have shed their spores, 

 each with four sterigmata; the spores of the second- 

 generation basidia, b, (shown black) ; the spores of tlie 

 third-generation basidia, c, (shaded with lines) ; and the 

 spores of the fourth -generation basidia, d, (unshaded). 

 B, camera-lucida drawing of a piece of hymenium showing 

 position of the elements after the cessation of spore- 

 discharge. The hymenium is composed of a pavement 

 of paraphyses, e, in which are set the collapsed basidia, b. 

 Adhering to it are a number of wasted spores, w. C, the 

 same as A, with the basidia and paraphyses added semi- 

 diagrammatically. D, the same as C with spores left 

 on the basidia of the fourth generation only ; d, fourth- 

 generation basidia ; e, paraphyses ; /, collapsed basidia 

 of the first three generations. Magnification, 350. 



several areas are square in outline and tend to form a pattern like 

 that on a chess-board. The basidia are arranged in lines, one being 

 set wherever four paraphyses meet. Where two chess-board areas 

 meet, the junction is effected by elements which are arranged less 

 regularly. Often the junction-paraphyses have three or five sides 

 instead of the usual four. From studies such as that illustrated in 

 Fig. 8, one gains the impression that the chess-board-like areas 



