224 MONOGRAPH OF CHAETOMIUM AND ASCOTRICHA 
Zopp? Boulanger is identical with Ascotricha chartarum, described 
by Berkeley in 1838, it seems to the present writer more desirable 
to return to the use of the original name given by Berkeley than 
to continue the names given by more recent authors. 
As in Ascotricha pusilla conidial growth precedes the formation 
of perithecia. The conidiophores to the naked eye are greenish- 
gray when young and black at maturity. Under magnification 
they are dark olive-brown to black near their base and about Su 
in thickness, clearly but irregularly septate and very profusely 
and sympodially branched, each individual axis producing a single 
branch, or forking and producing two symmetrical branches 
beyond the point of origin of which the axis terminates in a color- 
less, clavate ampulla. This may be several times repeated and the 
peripheral branches thus produced may form an irregular whorl, 
from which arise clusters of conidia which are roughly spherical, 
ovate or egg-shaped, roughened by minute warts, hyaline when 
young and olive-yellow or olive-brown when mature, 6.1 X 5.14 
(5.4-7-2 X 3.6-5.9). | 
This species is most often found on paper and cardboard, but 
like As. pusilla, the only form with which it is in danger of being 
confused, it occurs frequently on barrels or boxes in cellars. A 
comparison shows at once that in the case of the former the регі- 
thecium is of greater average size, the hairs are much stiffer, 
straighter, and more profusely branched, the spores are larger 
and easily distinguished by the fact that they are circular in face 
view, but lenticular with a girdle at the margin, when seen in 
profile. 
