﻿BOTANICAL GAZETTE 



subhymenium or trama. As Buller has stated , their hold upon the 

 adjacent lamella is so strong that it is difficult or impossible to 

 separate the lamellae without tearing. In an endeavor to separate 

 the lamella in the paraffin ribbon at the stage of development 

 shown in fig. 45, while smoothing it out on the slide, I have tried 

 overheating the ribbon. In all cases the lamellae were torn open 

 through the trama, the adjacent hymenia remaining as firmly 

 bound together as ever. While at this stage of development the 

 adjacent hymenia are in close contact so that the gill chambers 

 are obliterated, at the time of shedding the spores the lamellae 

 are spaced and the gill chambers are again apparent. The moving 

 apart of the gills is very likely brought about by the elongation of 

 the cystidia, for they are very much longer at maturity than at 

 the stage shown in fig. 45. 



Study of Corprinus micaceus 



The very young basidiocarps are oval or oboval in form. In the 

 youngest ones sectioned, the young lamellae were already present 

 as slight salients of the hymenophore extending from the stem 

 outward to near the young hymenophore margin. As shown in 

 figs. 46-49, the relation of the pileus and blematogen is of the 

 Coprinus type, the blematogen covering the pileus consisting of 

 radiating hyphae whose cells have swollen mostly into globose 

 forms. As they age the hyphae fall apart, forming a more or less 

 powdery material which adheres in small flocculent masses or 

 flakes, and in the light glisten to such an extent that they have 

 suggested the glistening of mica flakes, which easily fall away by 

 friction from foreign substances. 



Formation of a palisade layer on the outer surface of 

 the pileus. — At quite an early stage in the development of the 

 pileus, the hyphae on the upper surface grow in an irregularly radial 

 direction within the inner portion of the blematogen. This can 

 be seen in basidiocarps of the stage presented in fig. 68, which is a 

 somewhat more highly magnified photomicrograph of a section 

 from the same basidiocarp as fig. 46. On the surface of the pileus 

 can be seen faint indications of the radiating, more deeply stained, 

 hyphae. In a slightly older stage (fig. 69) they form a more com- 



