212 MONOGRAPH OF CHAETOMIUM AND ASCOTRICHA 
Chaetomium. The perithecia were described as minute, black, 
with short, rigid hairs. Saccardo (79, р. 594) has listed this 
form under the name Venturia Potentillae (Fr.) Cke. (18). Other 
authors have placed it under the following names: Coleroa Poten- 
tillae (Fr.) Wint. (110, p. 199); Dothidea Potentillae Fr. (37, p. 
563); Stigmatea Potentillae Fr. (39, р. 422). 
The very brief diagnosis of Ch. strigosum Wallr. (109, p. 265) 
is vague and insufficient, and unaccompanied by figures. Raben- 
horst (71, Хо. 1309) has called this Ceuthospora phaeocomes. 
Schweinitz (91, p. 265) in 1834 added the new name Ch. 
Typhae to the genus, but the original description is scarcely more 
than a note. Type specimens from the Curtis herbarium, now 
at Harvard University, have been examined by the writer, but 
no material could be found on the stalks of the Typha. Con- 
sidering the meagre description, there seems to be little reason 
for the continued use of this name or of the name Ch. Typhinum, 
which Schweinitz (91, p. 310) later used for this species. 
In 1845 Léveillé (52) published diagnoses of two supposedly 
new forms; Ch. Cumingii, which he found on fallen leaves near 
Manila, and Ch. viride, on fallen grasses in Paraguay. The 
diagnoses, unaccompanied by figures of any kind, are brief and 
of such a general nature that one is unable to gain any satis- 
factory knowledge regarding the real nature of the plants in 
question. It would seem that the use of both names may well 
be discontinued. 
The description of Ch. hispidum, published by Fries (39. 
р. 405) іп 1849, is brief, calling attention only to the most general 
characteristics and to the hemispherical shape of the perithecium. 
No measurements of structures are given and it is impossible to 
arrive at a satisfactory conclusion regarding his material. The 
fact that the asci are four-spored would, in any case, exclude 
this species from Chaetomium. 
In 1851 Bonorden (9) described Ch. ciliatum and Raben- 
horst published in the Bot. Zeitung (9: 453) a description of 
Ch. Braunii. In the same year Preuss (69) described Ch. concin- 
natum and Ch. tomentosum, and in 1852 added still another 
name, Ch. signatum. 
It may be seen from a study of Bonorden's description that the 
