TAXONOMY 
205 
on bread, jellies, old boots, gloves, and various pharmaceutical 
preparations. It consists of a felt-like mass of interlaced tubular 
hyphae called a mycelium. From the mycelium numerous hyphae 
project into the air and bear a green powder, the spores. These 
hyphae are called aerial hyphce. Other hyphae grow down into the 
substratum and are called submerged hyphce. 
When a small portion of the mycelium is mounted in 10 per cent, 
alcohol and observed under the high-power objective, it will be noted 
Fig. 85. — Saucer-shaped fruit-bodies of Pcziza repanda. {Harshberger , from 
Photo by W. H . Walmsley.) 
that each hypha has a transparent wall and protoplasmic contents 
and is divided by transverse septa into a number of cells. Each 
cell contains protoplasm, which is differentiated into cytoplasm (cell 
protoplasm) and several nuclei. In the cytoplasm will be seen several 
large clear spaces. These are vacuoles and contain water with 
nutritive substances in solution, called cell sap. Each hypha with 
its branches is clearly distinct from every other one. 
The aerial hyphae bear brush-like branches, which become con- 
stricted on their ends into a moniliform aggregation of rounded 
