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CHROMOGENIC FUNGI WHICH DISCOLOR WooD. 79 
masses, surrounded by either water or mucilage. They 
are unicellular, cylindrical in shape, hyaline, and measure 
64 to 8u by 1.8% to 2.2u, being of different shape 
and dimensions from the ascospores, and are thus easily 
distinguished from them under the microscope. The con- 
idia in mass as they become old have a gray color. 
PERITHECIA. 
The perithecia are formed by the union of two or more 
filaments of the mycelium. First, a gray mass of irregular 
cells appears at the pointof union. This rapidly develops 
into a globular perithecium, from the top of which there is 
then rapidly thrown out a beaked ostiolum, consisting of 
parallel filaments. The perithecia are brown to black in 
color, 90% to 180 in diameter, covered with sparse, con- 
ical spines, 12% to 16 long, with a diameter of 6y at 
the base. The beaked ostiolum is brown to black through- 
out its length, striate, and is surmounted by short, rather 
thick, hyaline bristles, measuring 124 to 184 by 2u 
(pl. 8, f. 5). When the perithecia are mature, the asco- 
spores are ejected in water in long, slimy, gray masses. 
In nature they are ejected in an irregular gray mass sup- 
ported by the terminal filaments of the beak. The asciare 
fugacious, hyaline, oval, and average 20uby 10u. The 
ascospores are hyaline, not guttulate, at least at first, oval, 
often flattened on one side, measuring 4¢ to 54 by 3u to 
4p. 
This species of Ceratostomella is so different in color 
from the other species studied as to suggest that it may be 
a Ceratostoma. The gray color of the mycelium on media 
in which the mycelium of other species remains hyaline, 
the constant tint of gray in mature conidia and ascospores, 
and the peculiar moniliform chains of conidia very distinct- 
ly set this form apart at least as avery distinct species. 
But since the color of the spores shows only in mass, it is 
Bf 
