﻿1916] ATKINSON— COPRLX US 127 

 surface of stem showing in middle portion; young hymenophore palisade above 



Fig. 10.— Tangential section of same basidiocarp, but farther from stem, 

 showing young hymenophore palisade above; X135. 



Figs. 11-16.— Longitudinal sections of another basidiocarp, parallel with 

 stem axis; see text diagrams for position of sections. 



Fig. ii.— One side of median section showing large annular gill cavity; 

 roof at right (next stem) sterile; over center the primordia of lamellae forming 

 (details shown in figs. 13-16); left of center young hymenophore palisade 

 which also extends downward; p, pileus; b, blematogen; X45. 



Fig. 12— Tangential section through palisade portion beyond gill salients, 

 that is, toward margin of pileus; by their radial or centrifugal growth gill 

 salients would later push down from this palisade; X45. 



Fig. 13. — Tangential section nearer stem, showing over middle portion 

 cross-sections of young gill salients; on each side palisade layer, farther from 

 stem, over which gill salients appear later; X45- 



Fig. 14. — Tangential section still nearer stem; gill salients over middle 

 portion less prominent than those on each side; section passing through 

 them at point where they originate just beyond sterile area next stem; toward 

 margin of pileus on each side is young hymenophore palisade; X45- 



through sterile area; on each side, farther from stem, young gill salients, and 

 nearer margin of pileus young hymenophore palisade; X45- 



Fig. 16.— Portion of tangential section near that of fig. 13 showing details, 

 on one side, of young hymenophore palisade and young gill salients; X160. 



Fig. 1 7 .—Median longitudinal section of another and slightly older basidio- 

 carp, somewhat tangential to middle line, so that young gill salients are cut 

 somewhat obliquely; note large gill cavity; p, pileus; b, blematogen; X50. 



Fig. 18— Tangential section of same beyond stem, showing cross-section 

 of young gill salients; X35. 



Fig. 19. — Portion of still older basidiocarp, nearly transverse to stem, 

 showing at one side transition from gill salients to young hymenophore palisade 

 and frazzled stage of young hymenophore next margin of pileus; note palisade 

 layer extending over margin of gill salients as it does in all younger stages; 



Figs. 20-22. -Tangential sections parallel with axis of stem, but through 

 curvature of pileus, and "back" or dorsum of the gills, lateral portion of pileus 

 at this stage being nearly parallel with stem, the margin curved inward by 

 epinasty; in fig. 20 section is nearer stem, so that middle gills are free at 

 lower extremity; in figs. 20 and 22, successively nearer pileus, all gills are cut 

 through dorsal portion; X40. 



method of attachment of margin of gills to stem; pressure of margin of gills 

 against stem, or fundamental plectenchyma on its surface, presses some mar- 

 ginally palisade cells laterally, while others, as well as some trama cells, 



