MONOGRAPH OF CHAETOMIUM AND ASCOTRICHA 203 
many with a single coil near the middle of their length, finely 
roughened throughout, below dark olive-brown to black, and 
about 7.5 и in thickness, clearly septate to near tips which are 
hyaline (along the hairs of this nature several branches may be 
produced, the branches partaking of the nature of the hairs). 
Asci club-shaped, 8-spored, 39 Х 9.7 и, pars sporif. 21 и. Spores 
when young greenish, hyaline with small refractive globules, 
when mature pale olive, when seen in face view four-sided and 
four-angled, either nearly square with equally rounded corners or 
with depressions in the four sides, in which latter case there are 
generally two acute angles at opposite ends which mark the length 
of the spore, while the angles at the sides are broad and obtuse, 
7.3 X 6.3 и (6.4-8 X 5.6-6.4), when seen edgewise ovate, 3-4 и 
broad. А 
Cultivated on dung from Cambridge, Massachusetts (Chivers 
No.29). Appearing also on dung from Chile and from Little Swan 
Island, Gulf of Mexico. 
This species may be easily identified by its spores, which when 
seen in face view are four-sided and four-angled, but when seen 
in profile are oval. Ch. quadrangulatum and Ch. trigonosporum 
are the only species known to the writer which possess spores 
with angles, the former having spores clearly quadrangular, the 
latter clearly triangular. 
25. CHAETOMIUM CAPRINUM Bainier, Bull. Soc. Myc. France 25: 
223. pl. 24. 1910 
PLATE 13, FIGS. 18-22 
eel gray. Perithecia large, tall, greatly elongated with 
greatest width just above the base, then narrowing wit the 
upper portion cylindrical, 580 X 2154 (400-580 X 200-228), 
seated on a subiculum of dark olive-brown to black rhizoids, with 
perithecium wall composed of cells greatly elongated in а plane 
parallel to the long axis of the perithecium, often provided with 
short, stout, black cirrhi. Lateral hairs rather numerous, tapering, 
septate, smooth or minutely roughened with spines, some uncuti- 
cularized, colorless and easily collapsible, others stoutet, at base 
dark olive-brown and about 6.6 шіп thickness, fading and tapering 
gradually to a colorless, collapsed tip. Terminal hairs almost 
entirely obscured at maturity by the mass of spores, smooth or 
remo tely septate, 
at base straight or flexed, dark olive-brown, about 7.5 # 1n thick- 
ness, fading toward tip, coiling above irregularly or in the form 
