166 MONOGRAPH OF CHAETOMIUM AND ASCOTRICHA 
ove. Plant golden-yellow. 28. Ch. torulosum (p. 207). 
1. Chaetomium trigonosporum (Marchal) comb. nov. 
Bommerella trigonospora Marchal, Bull. Soc. Roy. Bot. Belgique 
24:1. 1885; 28: 261—271. pl. 10. 1889. 
PLATE 6, FIGS. 6-11 
Black. Perithecia of medium size, globose or subglobose to 
somewhat elongated, 315 X 221 и (250-340 X 160-262), pro- 
vided with long, slender, straight or curved, black cirrhi, seated 
on a mat of hyphae which are olive-yellow to olive-brown. Lateral 
hairs rather numerous, comparatively short, spine-like, tapering, 
below dark olive-brown, minutely roughened, conspicuously and 
evenly septate, at base about 4.7 и п thickness; above faded, pale 
yellow, obscurely septate, smooth, near tip colorless. Terminal 
hairs straight, unbranched, longer than the lateral ones, dark 
rich olive, regularly septate to near the tips, smooth or only 
slightly and obscurely roughened, at base about 4.7 и in thick- 
ness, at tip pale yellow or colorless, without septa. Asci narrowly 
and irregularly club-shaped, 8-spored, 50 X 8 и, pars sporif. 32 и. 
Spores when young greenish and filled with highly refractive 
globules, when mature rich olive-yellow to dark olive-brown, in 
face view irregularly triangular, 8.9 X 5.7 и (8.1-9.7 X 4.8-6.4); 
when seen edgewise nearly oval, 3.6-4 и broad. 
Оп rabbit dung, North Carolina, Herb. В. Thaxter (Chivers 
No. 6). Type locality: in heath near Aerschot, Belgium; 
on dung of hare. 
So far as the writer is aware this is the only form with straight, 
unbranched, terminal hairs to be included in this genus. The 
species has been grown in varied cultures for many years and 
seems to be a true Chaetomium both in its life history and specific 
characteristics. While the spores which are here roughly tri- 
angular differ in shape from those of the greater number of species, 
the variation is no greater than in those of Ch. quadrangulatum 
where they are four-sided and four-angled. 
2. CHAETOMIUM MURORUM Corda, Icones т: 24. pl. 7, $. 203В- 
1837; Icones 2: 29. pl. 13, {. 103. 1838 
Chaetomium comatum, var. helicotrichum Saccardo, Michelia I: 
222. 1878. | 
