CHROMOGENIC FUNGI WHICH DISCOLOR woop. 109 
slightly resembles the conidia of Cephalothecium (pl. 12, 
f. 3). 
The microconidia are oval to elliptical in shape, varying 
in length from 8y to 14.54, and in diameter from 3p to 6p. 
They are hyaline, colorless, thin walled, and are usually 
uninucleate. Many are slightly curved. 
MAcROCONIDIA. 
The macroconidia are of the Fusarium type, and vary 
considerably in shape and size. They are usually formed 
by abstriction of the ends of short, swollen, branching 
hyphae, and are from two- to four-celled, straight or 
curved, with tapering, rather blunt ends, varying in length 
from 19 to 30u, and in diameter from 3.54 to 64. Both 
microconidia and macroconidia germinate readily on all 
ordinary agar culture media, the time varying with the 
medium. The macroconidia are rarely found attached to 
the hyphae when fully mature. 
CHLAMYDOSPORES. 
Both terminal and intercalary chlamydospores are 
formed singly or several in series (pl. 12, f.6,8,9). They 
are formed by the enlargement of the cells of the mycelial 
filaments. Their development is more gradual than that 
of the conidia, and the cell wall is much thicker. In shape 
they are spherical, or slightly oval. The cell contents are 
granular, and vary in color from yellow to dark brown. 
The diameter of the spores averages 124. When the 
macroconidia start to germinate, and are hindered by a sud- 
den drying out, or other adverse conditions, it is not unus- 
ual for one of the cells to form a chlamydospore (pl. 12, 
f. 5); these are rarely mature, and have never been 
observed to germinate. 
SCLEROTIA. 
Sclerotia are produced in cultures on boiled potato and 
