MONOGRAPH ОҒ CHAETOMIUM AND ASCOTRICHA 175 
tips of the terminal hairs, and in the irregular, oval shape of its 
spores. From the latter species it differs also in producing long, 
black cirrhi, in the incurved extremities of its terminal hairs and 
in the size of its spores and their irregular oval shape. 
The name of this species suggests the characteristic golden- 
yellow of the mature plant, but the color usually disappears as 
the plants grow old or as they are dried for herbarium specimens, 
and the highly colored perithecium becomes black. Moreover 
the cirrhi of spores are frequently so long that they overturn the 
perithecium. 
II. CHAETOMIUM FUSIFORME Chivers, Proc. Ат. Acad. 48: 87. 
1012 
PLATE II, FIGS. 7-11 
Gray or pale olive. Perithecia minute, globose or ovate 
with a bluntly pointed base, 120 X 102 и (116-123 X 101-125), 
without cirrhi, producing at base a few yellow rhizoids. Lateral 
hairs numerous, slender, flexed, not spirally convolute, regularly 
and distinctly septate, olive-yellow, minutely roughened, about 
2.5 ш in thickness at base. Terminal hairs stouter and more 
darkly colored than the lateral hairs, minutely roughened, olive- 
brown, си апа distinctly septate, nearly straight or in- 
curved, about 3.7-4 и in thickness at base, at tip circinate or 
slightly convolute. Asci club-shaped, 8-spored, 48 X II и, pars 
sporif. 32 u. Spores when young filled with refractive globules, 
when ‘mature olive-yellow or olive-brown, long, narrow, some- 
what fusiform, round or apiculate at the ends, 15.8 X 5.4 и (15-16 
4.8-5). 
A rare species having appeared only oncé on paper from 
Alabama, Herb. R. Thaxter (Chivers No. 3). 
The long narrow spores distinguish this form from all other 
species of Chaetomium. In general characteristics it most nearly 
resembles Ch. aureum and Ch. trilaterale, but differs from both 
in the long, slender, fusiform spores. 
12. CHAETOMIUM TRILATERALE Chivers, Proc. Am. Acad. 48: 87. 
12 
19 2 
PLATE 11, FIGS. 1-6 
Olive-yellow. Perithecia minute, globose or ovate with < 
bluntly pointed base, 106 X 94 и (100 X 90-97), without сит 
