﻿114 BOTANICAL GAZETTE [February 



is clear that the process is different from that which occurs in 

 Amanitopsis vaginata (see Atkinson io) and Amanita volvata 

 Peck, where the outer surface of the pileus primordium, by gelatini- 

 zation, or other means of disintegration in A. volvata, forms a 

 cleavage layer, thus freeing the blematogen, which then becomes 

 the volva or teleoblem. In Amanita muscaria a similar cleavage 

 layer is formed by gelatinization of the outer layer of the pileus, as 

 described by Brefeld (12, p. 125). 



The method of separation of the blematogen from the pileus in 

 C. micaceus is different, therefore, from that in the species of 

 Amanitopsis and Amanita just mentioned, and very likely in many 

 other species of Amanita which as yet have not been studied in 

 respect to this feature. The method of separation of the blema- 

 togen in other species of Coprinus and Amanita should be examined, 

 particularly viscid species of Coprinus, and species of Amanita with 

 a dry powdery volva. In some of the latter the pileus is viscid when 

 fresh, and it is likely that a cleavage layer is formed by the gelatini- 

 zation or other method of disintegration of the outer layer of the 



The general, annular, prelamellar cavity. — The general 

 annular gill cavity in C. micaceus is formed in the same way as 

 described for C. atramentarius . It is also weakly developed as 

 in that species. The tensions resulting from the differences in 

 growth tear apart and shred the ground tissue immediately below 

 the fundament of the hymenophore. Scattered threads here and 

 there extend across the cavity, connecting with the palisade 

 layer of the hymenophore fundament not only at points where 

 the first salients of the lamellae arise but also between them. 



Origin op the lamellae. — Since the organization and develop- 

 ment of the fundament of the hymenophore and of the lamellae 

 origins proceed in a centrifugal direction following the centrifugal 

 growth of the pileus margin, the presence of the palisade layer of 

 the hymenophore fundament, as well as the origin of the lamellae, 

 can be observed near the margin of the pileus in tangential sections 

 parallel with the axis of the stem. The older stages of the gills 

 can then be traced in the serial sections passing up to the stem. 

 The youngest basidiocarp studied is represented in longitudinal 



