170 MONOGRAPH ОЕ CHAETOMIUM AND ASCOTRICHA 
PLATE 9, FIGS. 1-4 
Dark gray to black. Perithecia of medium size, globose or 
subglobose, frequently of greater diameter horizontally, 231- 
295 X 231-327 и. Lateral hairs not differentiated, but appearing 
about the perithecium as a tomentum of yellow, semi-trans- 
parent, fine and delicate mycelial threads. Terminal hairs 
dense olive-brown to black, with low power smooth, but with 
immersion lens irregularly thickened with extremely minute 
spines, irregularly and sparsely septate, nearly straight below, 
contorted above into loops which are separated by long, graceful 
arches, terminating in an arch with circinate tip, 5.6-7 шіп thick- 
ness at the crown of the terminal arch. “Asci cylindrical, about 
80 X 9-10 yu, 8-spored." Spores monostichous, when young hya- 
line, filled with refractive greenish globules, when mature dark rich 
olive-brown, subglobose or very broadly elliptical, some clearly 
apiculate at one end, barely so at the other, others apiculate 
only at one end and rounded at the other, то X 8 u (9.5-10.5 
X 7-5-8.9), when seen edgewise, compressed, 6.4 и broad. 
Type locality: Kew, England; on dog dung. 
Although it has been impossible to examine type material of 
the plant which Bainier found on dog dung and described under 
the name Ch. glabrum in 1910, the writer is convinced that it is 
identical with Ch. simile. The measurements of the perithecia 
and spores are the same for both species and the development 
of the dark area near the top of the perithecium which Bainier 
noted as unusual appears in all species of Chaetomium where 
the wall remains so transparent that the darkened spore mass 
may be seen. 
Through the kindness of the Royal Gardens at Kew the writer 
has been enabled to study type specimens of Ch. simile, but 
as no asci could be found in mounts made from this material, the 
original description has been quoted and the figure of the ascus 
has been copied. 
At first sight one may confuse this species with Ch. contortum, 
Ch. crispatum and Ch. tortile. It differs from these, however, in 
the terminal hairs which are of much smaller diameter and which 
юа long, graceful arches between their loops. It differs also 
from Ch. contortum in the smaller size of the perithecium and 
ev both Ch. contortum and Ch. crispatum in its slightly smaller 
es. 
