CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 103 
from 52 to 10z. The latter form are of the nature of 
chlamydospores, having thick walls, and from one to two 
cells. These sometimes germinate, and apparently may 
function as resting spores. 
CONIDIA. 
Two forms of conidia are borne on the mycelium, one of 
these being the hyaline form (pl. 11, f. 5), which buds 
both «from the cells of the mycelium and from other conidia 
during the earlier growth of the colony. These are deeply 
imbedded in mucilage, and germinate readily, if not too 
old, in agar plate cultures. They are ephemeral, losing 
their power of germination ina few weeks. They are 
elliptical in shape, and measure 8. to 12, by 34 to dz, 
and are rarely septate. Among the hyaline conidia, as the 
colony grows older, brown forms of the same shape soon 
occur (pl. 11, f. 6), and finally become very abundant. 
These are thick walled, and do not appear to germinate as 
readily as the hyaline type. They probably function as 
resting spores. They are sometimes septate, but more often 
have one cell. They measure 10, to 14, by 5p to 62. 
Another form of conidia of the true type of Hormiscium 
(pl. 11, f. 7) is found borne from the filaments in the 
older portions of the extremities of the colony, and on the 
filaments in cultures upon wood. These are globose in 
form, of a dark olive color, not rugose, and are borne from 
short hyphae in chains of two to several. They measure 
from 7to 12, in diameter. These chains hold together 
tenaciously, and do not break apart like those of related 
genera. 
4, OTHER WoOOD-BLACKENING Funai. 
A number of other fungi were noted, which add to the 
stains which occur superficially on lumber, especially on the 
sapwood. Several of these were identified, which ap- 
parently discolor the wood only by the color present either 
