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98 MISSOURI BOTANICAL GARDEN. 
2. HoRMODENDRON. 
An intense black color in irregular blotches often oc- 
curs on new pine, elm, ash, gum, oak, and other kinds of 
lumber, when sawn under a moist condition, during warm 
weather. A large number of such spots were examined, 
and the fungi present isolated for investigation. Species 
of Hormodendron, Hormiscium and Alternaria were found 
present. Two species of Hormodendron were identified, 
viz: HH, cladosporioides (Fres.) Sacc. and a species not 
agreeing with any description previously published, and 
which is here given the name /. griseum. 
Inoculations of these two species were made upon pine, 
elm, oak, ash and gum wood. Both species were found to 
produce superficial black stains, but neither penetrates 
deeply into hard woods. On the other hand, either species 
penetrates deeply boards made from the red gum tree, 
Liquidambar Styraciflua L. Under the microscope the 
conidial clusters of the two species closely resemble each 
other, but in cultures the gross appearance of the colonies 
is constantly quite different, the former varying from a 
yellow-green to a dark olive, or almost black, the latter 
from a light gray to a color approaching black; other 
differences were noted in the length of the conidiophores 
and of the conidial chains. 
Hormodendron cladosporioides (Fres.) Sace. 
The species of /ormodendron most commonly found on 
boards is described here from artificial cultures, and 
assumed to be H. cladosporioides. Two other species oc- 
curring on wood, which have been previously described, 
but at alater date, are HZ. atrum Bon. and H. elatum 
Hartz. From the description of these two latter species 
it would be very difficult to separate the one from the 
