110 MISSOURI BOTANICAL GARDEN. 
rice. They vary in color from dark green to dark brown. 
As they grow older they become rather hard and dense, 
but bear no definite fruiting bodies. 
PERITHECIA. 
In all of our cultures no perfect form of fruiting has 
been found, although the fungus has been grown on all the 
common culture media. If such form exists, our failure 
to find it is due to the fact that natural conditions were 
not imitated closely enough to produce it. 
THE FORMATION OF COLOR. 
’ On pine sapwood, a red or purple color is produced, 
which in old cultures fades to a dirty brown. A number 
of species of Fusarium are now being grown on pine wood 
for comparison with this, and the results will be published 
ata later date. Musarium roseum secretes a soluble pig- 
ment which is taken up by the adjacent wood cells, stain- 
ing them lightly with a red or purple color, which varies 
with the acidity or alkalinity of the wood. In natural 
wood, which is slightly acid, the color varies from a pink 
to a lilac. In cultures where there is a profuse growth of 
the mycelium the colored chlamydospores and mycelium 
modify the appearance of the wood, giving it a dull color 
in contrast with the original brighter one. 
CAUSES OF COLOR IN WOOD STAINED BY THE FUNGI 
INVESTIGATED. 
1. CERATOSTOMELLA. 
The cause of the blue-gray or blue-black stain in wood 
penetrated by the mycelium of Ceratostomedla lies in the 
color of the filaments of the fungus, which exudes no stain 
from its mycelium. The dark brown pigment in the walls 
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