414 
HARRY M. FITZPATRICK 
the overlapping moss leaves and grow upward, sheathing the apical 
region and developing a clavate Typhula-like fruit-body. 
4. The cells of the hyphae composing the sporophore are all 
binucleate. 
5. The chromosome number in the conjugate divisions has been 
determined with reasonable certainty to be four. The nucleolus lies 
outside the spindle, and enters one of the daughter nuclei in telophase. 
6. The young basidia stand at right angles to the surface of the 
sporophore, and are unicellular and binucleate. Later the pair of 
nuclei approach each other and fuse. 
7. The fusion nucleus passes from the resting into the spirem stage, 
and later the thread contracts into a definite synaptic knot. 
8. The spindle of the first division is intranuclear. It holds no 
definite position with reference to the long axis of the basidium. A 
definite centrosome appears at each pole, but no astral radiations have 
been noted. 
9. The chromosome number in the first division is certainly four. 
As in the conjugate divisions the nucleolus enters one of the daughter 
nuclei. 
10. With the rounding up of the two daughter nuclei the basidium 
increases greatly in length, and the nuclei migrate into the opposite 
ends of the cell. They are considerably smaller than the fusion 
nucleus. 
11. The second mitosis is more difficult to study on account of the 
smaller size of the nuclei, but intranuclear spindles with centrosomes 
are formed. The two divisions are not always exactly simultaneous 
in the two nuclei. 
12. The four nuclei which round up after the second division 
migrate apart, and transverse septa are laid down dividing the basid- 
ium into four approximately equal superimposed, uninucleate cells. 
The central septum is laid down first. 
13. Each cell of the basidium puts out a long cylindrical sterigma 
into which passes all the cytoplasm and the nucleus of the basidial cell. 
The basidium does not produce sterigmata in all its cells simultaneously 
or in any definite order. The sterigma at maturity is sharp-pointed. 
14. A minute, globose spore ''initial" forms at the tip of the ster- 
igma, and this develops rapidly into an elongate spore which at ma- 
turity is more or less definitely crescent-shaped. All the cytoplasm and 
the nucleus of the sterigma pass into the spore, the nucleus being 
