168 MonoGRAPH OF CHAETOMIUM AND ASCOTRICHA 
type specimens of his variety and while he found a similarity to 
Ch. murorum only in the circinate tips of the hairs, the present 
writer has found all the characteristics of the plants examined to 
be typical of Corda’s species. On the contrary there seem to 
be no reasons for considering the form related in any way to Ch. 
comatum, since the hairs are not branched. 
Only Ch. elatum Kze. could be obtained from exsiccati speci- 
mens in Rabenhorst’s Fungi Europaei No. 234. 
Ch. murorum Cda. may at first sight be confused with Ch. 
circinatum, but may easily be distinguished from it by the smaller 
diameter of the terminal hairs which are only 5.5 и in thickness, 
and which are flexed not sinuous, slightly if at all recurved at 
their tips, and more minutely and inconspicuously roughened. 
3. Chaetomium circinatum sp. nov. 
PLATE 8, FIGS. 1-5 ; 
Gray-black. Perithecia of medium size, ovate or globose, 
325 X 312 u (270-344 X 258-335). Lateral hairs long, flexed, 
graceful, sparsely and irregularly septate, at base olive-brown, 
roughened, 5.6 in thickness, at the apex smooth, pale olive, 
slender. Terminal hairs dark, nearly opaque, olive-brown oF 
brownish-black, sinuous, 7 шіп thickness, at the base irregularly 
encrusted, at the apex smooth or only slightly encrusted, circinate, 
two to three times re-curved. Asci irregularly club-shaped, 
8-spored, 70 X 25 и, pars sporif. 50 и. Spores ovate or lemon- 
shaped, apiculate or umbonate, olive-brown, 14.3 X 8.9 и (12.9- 
I5.3 X 8.1-9.7) 
А rare species having appeared only once on a piece of old bur- 
lap in a refuse heap, Worcester, Massachusetts (Chivers No. 12). 
This species, while similar in certain respects to Ch. murorum, 
may be easily distinguished from it by the characteristic terminal 
hairs which are sinuous instead of flexed, roughened by crystals 
of calcium oxalate, which are irregularly clustered along their 
entire length, circinately recurved at the tips, the last coil of 
Which often springs out to one side or the other from the plane 
of coiling. 
