CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 99 
other, or either of them from WH. cladosporioides. The 
description of our fungus might fit any of the three, but 
as the last named species is the older, its name will hold 
valid. 
The following cultural characters were obtained from a 
large number of cultures on agar media, most of which 
were made from pine-decoction alone, or from the juices of 
vegetables combined with a pine-decoction :— 
MYCELIUM. 
Conidia sown on agar plates germinate and produce 
small, gray colonies visible to the eve in 24 hours. In 
three to four days the colonies begin to send up erect 
sporophores, bearing clusters of short septate branches, 
which are often branched again and from the ends of 
which branched chains of olive-colored conidia are formed 
(pl. 10, f. 1). The younger portions of the colony 
assume a yellow-green color, which rapidly changes to an 
olive, and finally to an almost black color, while the sur- 
face has a velvety appearance. The filaments are coarsely 
granular in the older portion, and are often constricted at 
the point of septation. They measure 2 to 8uin diameter. 
The sporophores measure 100 to 400y in length, and 3u 
to 4u in diameter; the branches are 1- to 2- rarely 3- sep- 
tate, and measure 6p to 15y by 3y to dp. 
CONIDIA. 
The conidia are borne in simple chains of 2 to 6, rarely 
more; they are not granular or guttate except when old, 
and vary in shape from a blunt to a pointed oval. They 
measure 34 to Tu by 2u to 4,. When mature, both the 
hyphal branches and the conidia are of a dark olive color. 
The work of Planchon* indicates tbat Hormodendron 
* Planchon, Louis. Influence de divers milieux chimiques sur quel- 
ques champignons du groupe des Dématiées. Annales des Sciences 
Naturelles. Botanique. 113 1-256. pl. 1-4. (1900). 
