210 MONOGRAPH ОҒ CHAETOMIUM AND ASCOTRICHA 
In 1818 Ehrenberg (28, pp. 15, 27) contributed a new species, 
Ch. gelatinosum, which, according to Zopf (113, p. 204), is either 
an undeveloped condition of some other Chaetomium, or more 
probably a Myxotrichum, and which is placed by Saccardo (79) 
among his doubtful species. The original description, containing 
only a few of the most general statements, and with no accompany- 
ing figures, is entirely inadequate. 
Fries (38) in describing a new species in 1829 under the name 
Ch. pusillum, overlooked one of the most salient characteristics 
of the genus pointed out by Kunze, namely,—the presence of an 
ostiole. This plant, possessing a minute, spherical, closed peri- 
thecium, with very short, stiff, opaque, bristle-like hairs, and 
producing spores which are at least one-septate, could hardly be 
classified as a Chaetomium. The same form has been observed 
by many authors since Fries’s time, and has been given names as 
follows: Acanthostigma Chaetomium Auersw. (1); Caelosphaeria 
exilis (Alb. et Schw.) басс. (79); Niesslia Chaetomium (Cda.) 
Auersw. (1); Niesslia exilis (Alb. & Schw.) Wint. (110); Niessha 
pusilla (Fries) Schroeter (89); Nitschkia exilis (Alb. & Schw.) 
Fckl. (42, p. 165); Peziza aterima Lasch; Sphaeria Chaetomium Cda. 
(21); Sphaeria exilis Alb. & Schw. (2, p. 44); Sphaeria exospori- 
oides Desm. (26, No. 126); Venturia Chaetomium (Cda.) Ces. & 
DeNot. (13). The present writer has seen authentic specimens 
of Ch. pusillum, which were distributed by Fries in the Sclero- 
myceti Sueciae XXVIII No. 272, and has found them to consist 
of small, black, naked pustules, not in the least resembling Chae- 
tomia, scattered over the surface of the pine needles. Specimens 
under the same name and with the same characteristics have been 
distributed by Rehm in Ascomyceten No. 1762. 
In 1833 Wallroth published, in the Flora Cryptogamica (109), 
eight new species which must be placed in the group of excluded 
names. They are as follows: Ch. Alchemillae, Ch. circinans, Ch. 
coccodes, Ch. depressum, Ch. epiphyllum, Ch. oxysporium, Ch. 
Potentillae, and Ch. strigosum. 
. Майго’ original description of Ch. Alchemillae (109, р. 873) 
is incomplete and leaves one uncertain regarding the exact 
nature of the form. That part of the description which is clear, 
however, would seem to indicate that the plant was a Ven- 
