200 MONOGRAPH OF CHAETOMIUM AND ASCOTRICHA 
Through the kindness of the New York Botanical Garden the 
writer has been enabled to examine type specimens of Ch. spiro- 
chaete which were collected on cotton roots at Ames, Iowa, by 
L. H. Pammel, and which were named Ch. spirochaete by Palliser 
in her monograph of the genus. These seem to be identical with 
Zopf's species. The envelope containing the type specimens 
bears the name Ch. bostrychodes Zopf, for which this material 
had previously been mistaken. On a slip of paper within the 
envelope, however, was written in the form of a note: ‘‘Spores 
10 X 7u, dark brown, too large for bostrychodes although same 
shape.” The large size and dark color of the spores are charac- 
teristics which easily separate this form from Ch. bostrychodes 
Zopf, and identify it with Ch. spirale Zopf. 
At first sight Ch. spirale Zopf might easily be confused with 
Ch. bostrychodes Zopf, which it so closely resembles so far as the 
hairs are concerned, but from which it differs markedly in spore 
characteristics. The characteristics of the asci are quoted from 
Zopf's original description. 
22. CHAETOMIUM ATERRIMUM Ellis & Everhart; Palliser, N. А. 
Flora 3: 62. 1910 
PLATE I2, FIGS. 1—4 
Gray black to black. Perithecium of medium size, ovate or 
subglobose, 275 X 200 u (190-300 X 160-230), seated on olive- 
yellow or olive-brown rhizoids. Lateral hairs numerous, long, 
slender, graceful, straight or slightly flexed, septate, gradually 
tapering, minutely roughened throughout or only near the base, 
below olive-yellow or dark olive-brown, 4-5 и in thickness at 
base, above pale yellow or hyaline. Terminal hairs very rarely 
producing small abortive branches, opaque, olive-brown or black 
and roughened by minute spines throughout, irregularly septate, 
at base 5-6 иіп thickness, at tip 8-11 шіп thickness, below straight 
or slightly flexed, above coiling 10-18 times (usually about 15) 
in a long, close, regular, cylindrical spiral, 45-60 и in diameter. 
Asci not visible. Spores olive-brown, lemon-shaped, slightly 
apiculate at either end, 7.5 X Dan (6.5-8 X 6.4), when seen 
edgewise, compressed, 4-8 и broad. 
This is ап exceedingly rare form apparently known only from 
the type locality: Rockport, Kansas; on damaged wheat іп а 
stack, 1891 (Bartholomew 448). 
