﻿BOTANICAL GAZETTE 



and right of the hymenophore the sections will soon begin to present 

 this relation of the lamellae (if the hymenophore is sufficiently 

 /PS advanced in age) even before the middle 

 portion of the sections has reached the 

 margin of the pileus. This is the situation 

 presented in fig. 20. As the middle of the 

 sections pass through the margin of the 

 pileus (when the fertile portion has been 

 reached), all of the lamellae will show the 

 trama continuous with the tissue below as 

 well as above (figs. 21 and 22). The 

 attachment of the gills with the tissue 

 "below" in the sections is at their point 

 of origin from the inner surface of the 

 pileus, exactly as in their attachment above. 

 The sections under such conditions merely 

 present the situation of the trama of the 

 lamellae being continuous with the trama 

 of the pileus at their point of origin. The 

 connection "below" in such cases is not 

 with the tissue of the stem, but with that 

 of the pileus. Great care is necessary to 

 avoid confusing such situations with those 

 in which the gills become attached to the 

 stem, for both situations may occur in the 

 same sections. Diagram V illustrates the 

 position, form, and relation of parts, and 

 direction of the cut in obtaining the sec- 

 tions for figs. 20-22. 



Study of Coprinus atramentarius 



The youngest specimens of Coprinus 

 atramentarius studied were in the phases of 

 development just prior to and during the 

 origin of the lamellae. No attempt has 

 it been made to study the earlier stages presented by the earliest 

 fferentiation of the pileus and stem, since the primary object of 



, or 3 gills 



irough dorsum 

 ;ar) and parall< 

 .ce of pileus (see 



