﻿BOTAMCAL GAZETTE 



form the gills. An examination of this situation, however, shows 

 that, since the fundament of the hymenophore descends a short 

 distance on the stem, when the first salients of the primary lamellae 

 arise, they are present on the stem and continue over the angle on 

 the under surface of the pileus. As these salients broaden into the 

 young lamellae, little "stalls" or pockets lie between them in the 

 angle between the apex of the stem and pileus. Longitudinal sec- 

 tions in this region will cut across the 

 "stalls," and at this stage, when the stem 

 surface slopes outward strongly, will be 

 parallel to a tangent of the curved or angled 

 lamellae, and will show the attachment of 

 the trama not only to the pileus above but 

 to the stem below. Such sections are per- 

 pendicular to the origin and direction of 

 growth of the lamellae. Diagram VI illus- 

 trates the situation in question. Plants 

 with adnate or decurrent lamellae are very 

 favorable subjects for obtaining such de- 

 ceptive sections. As stated previously 

 therefore, C. comatus is a very favorabl- 

 object for studying the origin of th 

 lamellae, since the gills in all stages f 

 development are so distant from the apx 

 of the stem. A situation similar to tHt 

 represented in fig. 40 may even be pre- 

 sented by species with "free" gills, sice 

 there is often variation in individual in 

 respect to "free" or "adnexed" jills. 

 In another paper I shall showthat 

 the same situation is present in some individuals of Atricus 

 rodmani. 



Cystidia. — No special effort has been made to stuy" the 

 cystidia, but their presence and relation in sections of medmi and 

 nearly mature plants was so striking as to excite int<est and 

 some observation. When the lamellae are quite well ivanced, 

 but still moderately young, the cystidia are quite nurrrous and 



re 3 4 



Diagram VI.— Lateral 

 view through one side of 



gills; gill origins extend 



"stalls" but through gill 

 origins both "above and 

 below" (see fig. 40). 



