282 BOTANICAL GAZETTE [NOVEMBER 
tint. Conidiophores varying from ten to several hundred microns 
in length arise at irregular intervals from the hyphae. The shortest 
of these have little or no filamentous part, but consist merely of 
the head and sterigmata (fig. 28). Sterigmata are also borne singly 
and in groups of from two to four on the hyphal cells (fig. 27). 
The heads of the conidiophores measure 10-20 uw in diameter, and 
the sterigmata, from two to many per head, are 10-12 5-7 up. 
The globular, echinulated conidia are of different shades of 
yellow, and 5-10 uw in diameter, but the predominant size is 7 u 
(fig. 29). | 
CULTURE CHARACTERS.—On cornmeal agar the rate of growth 
varies from 0.3 to 1.0mm. daily at room temperature, and after 
forty-eight hours the central portion of the thallus shows the 
forming spore clusters in Light-Buff. The spore masses become 
darker with age until Lemon-Chrome is finally reached. On Brazil 
nut agar the growth is very similar to that on cornmeal agar, but 
with a halo 1 to 2 mm. in width, showing the presence of an extra- 
cellular, proteolytic enzyme surrounding the thallus. The color 
of the spore mass at maturity is from Orange-Cinnamon to Mikado- 
Brown. On nut plugs the growth is rapid, and a gas with the 
odor of carbon bisulphide is evident. The color of the spore mass 
is Primrose-Yellow at first, Honey-Yellow to Tawny-Olive at 
maturity. At the end of two or three months all that remains of 
the nut plug is a mass of partially disintegrated cell walls in a mass 
of mycelium. 
The growth on autoclaved rice is vigorous, with spore masses 
forming within forty-eight hours. There is little change in the 
color of the medium except for the development of a slight greenish- 
yellow tint below the spore mass. The color of the spore mass 
changes from Oil-Yellow to Orange-Cetrine. The odor of a 30-day 
old culture is very like that of cider vinegar. The nut strip above 
the water is entirely covered with spore masses within three days, 
but only about one-fourth of it is destroyed before it becomes too 
dry to support the fungus. A luxuriant growth of mycelium arises 
from the strip in the water, and usually the strip is destroyed before 
fifteen days. 
