220 MONOGRAPH OF CHAETOMIUM AND ASCOTRICHA 
Ascotricha pusilla (Ellis & Everhart) comb. nov. 
Chaetomium pusillum Ellis & Everhart, Proc. Acad. Nat. Sci.. 
Phil. 1890: 220. 1800. 
Chaetomium Ellisianum Saccardo & Sydow, Syll. Fung. 14: 491. 
1899. 
PLATE 17, FIGS. 13-21 
Black. Perithecia small, globose, the body somewhat broader 
than long, constricted above to form a distinct neck, 151 X 1664 
(135-190 X 139-202), extruding long, black cirrhi, rather firmly 
adnate to the substratum and associated with numerous conidio- 
phores. Lateral hairs when present sparsely scattered over the 
upper portion of the perithecium wall, slender, whip-like, more or 
less flexed or gracefully recurved to form a loop, tapering almost ` 
imperceptibly, evenly and remotely but obscurely septate, slightly 
swollen at the septa, near the base dark olive-brown to blac 
and about 5.6 in thickness, becoming pale olive at the tips, 
unbranched except very rarely when the short main axis pro- 
duces an extremely long, whip-like outgrowth just above the 
origin of which the axile portion terminates in a club-shaped, 
hyaline ampulla. Terminal hairs arising in the region of the 
neck, extremely long, slender, whip-like, graceful, smooth and 
even, with the exception of slight angular swellings at the septa, 
flexed and often recurved forming a loop, septate but so dark 
below that the septa are nearly obscured, very dark olive to 
black and about 5.6 шіп thickness at the base, almost imperceptibly 
tapering and fading toward the pale olive tip, unbranched except 
in rare cases, where branching takes place in the same manner 
as described above for the lateral hairs. Asci extremely deli- 
cate, linear, cylindrical, 8-spored, 60 X би, pars sporif. 43: 
Spores monostichous, hyaline when young, when mature dark 
olive-brown, ovate, roughly egg-shaped, rounded at both ends, 
56 X 4.2 џ (5.4-6 X 3.5-4.5), when seen edgewise, compressed, 
3.2 и broad. 
Оп barrels in cellar, Cambridge, Massachusetts, and Kittery 
Point, Maine, herb. К. Thaxter; on barrel hoops and packing 
boxes in cellar in Hanover, New Hampshire, and Amesbury, 
Massachusetts (Chivers No. 41). Reported also by G. F. Atkin- 
son from Alabama, growing on old paper. 
Type locality: as Ch. pusillum Е. & E., Newfield, New Jersey; 
on basswood barrel bottom in cellar. Also Manhattan, Kansas; 
on an old churn in cellar (Kellerman 1437). 
The original material of this species was collected by Ellis 
