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MONOGRAPH OF CHAETOMIUM AND ASCOTRICHA 219 
Fungi (2: 653), and defined it as follows: perithecium thin, free, 
astomate, seated on loose, branched, conidiophorous threads; 
sporangia linear, containing dark, elliptical sporidia. 
These fungi should not be considered as true Chaetomia, but 
rather as species of an allied genus. The spherical perithecia, 
almost naked below and constricted at the top into a neck from 
which the terminal hairs arise, the curious stiff or whip-like am- 
pullate hairs bearing large numbers of conidia, and the disc- 
shaped spores of one of the species, afford a sufficient basis for 
separating. these forms from the genus Chaetomium. The earlier 
writers mentioned above were not aware that the perithecia of 
Ascotricha were provided with an ostiole, for Berkeley stated that 
the perithecia finally burst, and Cooke described them as astomous. 
Otherwise their descriptions are reasonably clear, and it therefore 
seems best to restore Berkeley’s original name Ascotricha to his 
species, and to change the name of Ch. pusillum E. & E. to Asco- 
tricha pusilla. 
CHARACTERS OF THE GENUS ASCOTRICHA 
Perithecium when young subconical, dark green and trans- 
lucent, when mature spherical or nearly so below, constricted 
above into a narrow and distinct neck, perforated by a central 
ostiole. Differentiated rhizoids lacking. Perithecial wall brittle, 
membranaceous. Lateral hairs colored and branched, varying 
in number, sometimes numerous, but at times almost wanting. 
Terminal hairs numerous, arising from the region of the neck, 
branched sympodially, and distinguished by the prese of 
clavate ampullae. Asci linear, cylindrical, 8-spored. Spores 
arranged in a single row in the ascus, simple, dark colored, dis- 
charged from the ostiole in a black cylindrical cirrhus. 
КЕҮ TO THE SPECIES OF ASCOTRICHA 
Perithecial hairs and conidiophores slender, frequently 
gtacefully flexed, sparingly branched. Conidia 5.5 Х 
3.5 и, smooth or nearly зо. Ascospores ovate to egg- 
ped, 5.5 X 44 nA T г. As. pusilla (p. 220). 
Perithecial hairs and conidiophores stout, profusely 
ties ia 6 Хун, roughened minute 
hed. Coni 
wart-lik jecti isc-shaped, 8 X 
e projections. Ascospores disc-s1Ap 2. As. chartarum (р. 222). 
7-5 и. 
