CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 77 
* 
almost black, color. The development of the fungus on 
wood is slower than that of C. pilifera, staining pine, oak, 
elm and ash with a blue-black discoloration contrasting 
sharply with the unstained portions. The mycelium pen- 
etrates pine wood through the medullary rays, and in some 
cases enters the wood fibres. The hyphae of the hyaline 
mycelium bearing conidia average 2.5y in diameter, while 
the dark brown filaments in wood measure from 2p to 
6u, averaging 4 in diameter. On the surface of wood 
in the vicinity of perithecia some filaments have swollen 
cells. Many of the filaments in wood cells have fine trans- 
parent roughenings all over the surface. 
ConrpIA. 
The conidia, like those of C. pilifera, are borne in 
whorls of single spores and short moniliform chains inter- 
mingled (pl. 6, f. 4,5). In older cultures they drop 
together in clusters resembling somewhat those of Cepha- 
losporium. They are oval to elliptical in shape, one-celled, 
hyaline, and vary in size from 3.54 to 4.5, in length, and 
1.64 to 2.2uin width, averaging 4u by 2y (pl. 6, f. 6). 
PERITHECIA. 
In artificial as well as in natural growths, the perithecia 
are very abundant. They are formed in large numbers 
under favorable conditions after 10 to 14 days. The pro- 
cess of formation is similar to that of C. pilifera. The 
perithecia are globose. They are black, brittle, with a 
roughened surface. They measure 604 to 80, averag- 
ing 73 in diameter, with a beaked ostiolum 150p to 2004 
in length, and 8u to 18m in diameter, averaging 1804 by 
14u (pl. 3, f. 2). The asci are hyaline, irregularly 
oval to elliptical, and contain 8 spores, often arranged in 
fours. The ascospores are hyaline, elliptical, sometimes 
slightly curved, and measure 2.1luto 2.84 in length, and 
8 to 1.1uin width, averaging 2.54 by lp (pl. 6, f. 7). 
The sacs usually disappear before the spores are ejected. 
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