80 
OHIO BIOLOGICAL SURVEY 
Hairs not circinate. 
Hairs numerous, olivaceous, 500-1000 mic. long. 2. C. olivaceum 
Hairs more or less spirally coiled. 
Hairs irregularly and spirally twisted at the end, straight at the base and 
incrusted. 3. C. spirochaete 
Hairs more or less regularly coiled at the end in 4-10 spirals, pale-brown. 
4. C. bostrychodes 
Apical hairs all or partly branched. 
Hairs all branched. 
Hairs more or less deeply incrusted, 700-900 mic. long. 5. C. elatum 
Hairs branched and simple. 
Hairs smooth or slightly incrusted. 6. C. funicola 
1. Chaetomium murorum Corda, Ic. Fung. 1: 24. 1837. 
Perithecia more or less gregarious, subglobose or globose, with short, 
papilliform ostiolum, * (sometimes collapsing, 150-250 mic. in diameter), 
dark-brown, membranous; apical hairs simple, curved, (often 1mm. in 
length), 5 mic. thick, septate, smooth or slightly granular, subhyaline 
to dark-brown or almost black, circinate at the ends; lateral hairs simple, 
bent upward at the middle, 500 mic. long, 6 mic. thick at the base, 
septate, smooth, except the base, subulate, dark-brown at the base to 
paler at the tip, less numerous than the apical; paraphyses not observed; 
asci broad clavate, short-stipitate, slightly immature ones 38-56x11-19 
mic., 8-spored, very evanescent; spores irregularly arranged, bright 
olive-green, ellipsoid, apiculate at both ends, 12-16x7-8 mic. 
Habitat: On dead poplar, dry grass, and goat and rabbit dung. 
Distribution: New York to Ohio and Montana; also in Europe. 
Illustrations: PI. I, f. 1-8; Corda, Ic. Fung. 1: pi. 7, f. 293, B; 2: pi. 13, 
f. 103; Nova Acta Acad. Leop.-Carol. 42: pi. 19, f. 13-20. 
Type Locality: Prague, Bohemia. 
Distinctive Character: Circinate apical hairs. 
’Notes: That part of the description in parentheses is taken from Miss Palliser. 
Plants cultivated in the laboratory, Feb. 10, 1917, on rabbit dung collected by Wm. Schaeffer, 
near Wyoming, Oct. 3, 1914. 
2. Chaetomium olivaceum Cooke & Ellis, Grevillea 6: 96. 1878. 
Perithecia scattered or gregarious, broadly ovoid or ellipsoid, often 
pointed at the base, 200-305x175-250 mic., in fresh condition olivaceous 
but in dry specimens dark-brown, opaque, membranous, thickly and 
evenly clothed with slender, flexuous hairs; apical hairs simple, flexuous, 
often 700 mic. long, rarely 1000 mic., 3-4 mic. thick, somewhat coarser 
than the others, sparingly septate, minutely scabrous, in fresh condition 
pale-olivaceous, in dry condition light-brown; paraphyses filiform, longer 
than the asci and mixed with them; asci clavate, broadly rounded above 
and narrowed below into a comparatively slender stipe, spore-bearing 
part 35-50x12-15 mic., 8-spored; spores irregularly crowded at the tip of 
