1902] BINUCLEATE CELLS IN HYMENOMYCETES A 25 
Fic. 10. Semi-diagrammatic section of the aerial portion: the upper 
layer is a young hymenium with basidia in various stages of development ; 
to the right isa basidium with nearly ripe spores, each with a single nucleus ; 
next .to this basidium on the left is a young, only partly grown cystid, with 
very densely stained content; below the hymenium is a layer of vegetative 
tissue which has replaced a former hymenium; this is borne on three hyphal 
branches springing from the substratum below. X 800. 
Coprinus ephemerus. 
Fic. 11. Section of young gill made up of binucleate cells. x 800. 
Fic. 12. Transverse section of a group of cells from near the upper end 
of the stipe of a very young fruit body. X Io000 
Fic. 13. Section of a bit of the seipheral: tissue of the pileus, shows 
the columnar outer layer and four of the elongated papilla-cells. 
IG. 14. Parts of the walls of three sub- hymenial cells showing the pairs 
of bodies marking the position of intercellular pores. 
