Nichols—Binuclealed Cells in Boyne Basidiomyceles. 53 
tral body, on the opposite side. The remainder of the nucleus is 
filled with a finely granular* chromatin which takes a stain that 
is only slightly darker than that of the granules in the surround¬ 
ing cytoplasm from which it is sharply separated by the nuclear 
membrane. All of the cells contain two and only two nuclei 
which may lie near together or separated by the entire length of 
the cell. Occasionally the cells had one or two small crystals. 
The slender hyphae are formed of very long narrow cells 
which are filled with very dense cytoplasm. The nuclei are large, 
occupying nearly the entire diameter of the cell and lie close 
together at the center. When these hyphae reach the surface of 
the strand their walls become thickened leaving only a very small 
central strand of cytoplasm. 
All of the cells have deeply staining convex plates on opposite 
sides of their cross walls. These convex plates always appear in 
pairs with their concave surfaces towards each other. 
Lepiota naucina. (Fig. 21.) 
The mycelial strands of Lepiota naucina are very similar in 
appearance to those of Pholioia. They were found growing in 
the newly deposited mulch around the base of some young trees. 
It was impossible to obtain the mature carpophore attached to 
the strands but by loosening the substratum carefully I could 
obtain long strands still attached to the young buttons. 
The structure of the strands differs in a few respects from 
those just described. In the interior of the strand the hyphae 
do not show T any regularity of arrangement. The large celled 
hyphae are separated by a number of fine branches and are much 
fewer than in Pholioia. They are formed of large cells, with 
slightly rounded ends where the cross walls are formed. The 
slender hyphae arise as lateral branches of the larger ones and 
are very abundant. They wind among the larger hyphae form¬ 
ing a dense weft. Near the surface there is a layer of several 
cells thick entirely composed of slender hyphae. The cells are 
much shorter than in the center of the strand and each cell 
branches so that a close net-work is formed. Outside of this 
there is a felted layer of thick walled hyphae. The thick w'alled 
