162 
- right to left, the other half turning from left to right, with a short 
straight piece between the two opposite spirals, as in some tendrils. 
e wall of the ascus deliquesces at an early stage, leaving the 
spores free in the perithecium, from which they are expelled at 
olive, and usually quite opaque. The epispore is quite smooth 
in all known species. 
Zopf has given an exhaustive account of the morphology of the 
various species of Chaetomium accompanied by very beautiful 
illustrations in Entwickelungsgeschichte der Ascomyceten ; Chaeto- 
mium, a Acta der Ksl. Leop.-Carol, Deutschen Akademie 
der Naturforscher, Band xlii., no. 5. 
Key To THE SPECIEs. 
Crown-hairs spirally coiled throughout their length— 
All the crown-hairs spirally coiled ... .»  C. bostrychodes. 
Straight hairs mixed with others that are spirally coiled 
: - crispatum. 
Crown-hairs straight or slightly wavy, circinate at the tip— 
Spores 14-18n diam. ... ve fe --» C. murorum. 
Spores 7-9. diam... oot .» C. arachnoides. 
Crown-hairs with an interrupted spiral, turning alternately to 
left and right ... wee Sie ic oi C..stinile, 
Crown-hairs slightly wavy throughout their length C. Kunzeanum. 
Crown-hairs straight, branched— 
Perithecium elongated, sub-cylindrical .. C. comatum. 
Perithecium broadly elliptical or sub-globose  C. pannosum, 
Chaetomium bostrychodes, Zopf, Entwickel. d. Ascomyceten, p. 81, 
tab. 7, figs. 14-28 (1881); Sacc., Syll., 1, p. 224 (1883). 
Perithecium narrowly elliptical, or sometimes almost cylindrical, 
320-3504 high, 200-2401 broad, brown; mouth small, papillate, 
almost colourless; crown-hairs rather stout, septate, slightly asperate, 
closely coiled into a long, cylindrical spiral up to the end, collec- 
tively forming a large, subglobose tuft ; hairs on the body of the 
perithecium short, straight, sharp-pointed, blackish, at first spreading, 
then pointing upwards ; rhizoids not very numerous. Ascz clavate, 
50-55 x 1l-l4u. Spores irregularly 2-seriate, broadly elliptical, 
laterally compressed, smooth, olive-brown, 6-7°5 x 5u. Conidia 
unknown. 
Hap.—On decaying plant and animal remains, dung, &c. On 
blotting-paper in a Petri dish, Jodrell Laboratory, Kew. 
_ Most closely allied to C. spirale, Zopf, which differs in its larger 
size, and lemon-shaped, larger spores, 
