28 
I 
Valsa grisea. — Pustules small, perithecia four to fifteen in a 
pustule, nestling in the inner bark, their necks converging and pierc- 
ing the small, orbicular, erumpent, grayish or brownish disk ; ostiola 
punctiform, black; asci clavate, .002 to .0024 in. long ; spores allan- 
toid, colorless, .0004 to .0005 in, long. 
Dead branches of ash [Fraxtuus Americana) and of maple {Acer 
rubrnm), Canada ; Macoun. 
The pustules are often arranged in rows. The grayish disk be- 
comes darker with age. 
Valsa fraxinina. — Pustules small ; perithecia minute, three to 
ten in a pustule, nestling in the inner bark; ostiola minute, puncti- 
form, black; asci subclavate, .002 to .0024 in. long, .0003 in. broad; 
spores allantoid, crowded, colorless, .0005 to .0007 in. long, .00016 to 
.0002 in. broad. 
Dead branches of ash {Fraxinns Americana)^ Canada; Macoun. 
Closely related to the preceding species, from which its larger 
spores and the absence of a grayish, pulverulent disk will separate it. 
Valsaria purpurea. — Pustules prominent, erumpent, covered 
with a purplish tomentum ; perithecia six to twenty in a. pustule, 
crow^ded, subglobose, black; ostiola piercing the tomentum, rostrate, 
cylindrical or elongated-conical, rugged, sometimes curved or flexu- 
ous, black ; asci cylindrical, paraphysate, .003 to .0045 in. long, .0004 
in. broad ; spores uniseriate, colored, oblong-elliptical, uniseptate, 
.0006 to ,00065 !"• lo^^g? .0003 to .00035 ^^ broad. 
Dead bark of ash. Canada; Macoun. 
Remarkable for, and easily known, by, the purplish tomentum of 
the pustules. 
Hypomyces xylophilus. — Subiculum effused, whitish; perithecia 
numerous, crowded, small, subflavid, with a blunt ostiolum; asci 
cylindrical, .0035 to .0045 in. long, .00025 ^^ .0003 in. broad; spores 
simple, uniseriate, subfusiform, .0006 to ,0007 in. long, .0002 to 
.00025 in. broad. 
Decaying wood. Ohio; Morgan. 
The species is remarkable for its peculiar habitat. By reason of 
its simple spores it belongs to the subgenus Peckiella, 
Pyrenophora depressa. — Perithecia .010 to .014 in. broad, 
depressed or collapsed, at first covered by the epidermis, then erump- 
ent or naked, black, sometimes surrounded at the base by a few 
appressed, black, radiating filaments, furnished above with a few short, 
erect or divergent, straight, black, setae; asci cylindrical or subclavate, 
.0045 to .006 in. long; spores crowded or obliquely monostichous, 
oblong or subovate, triseptate, with one or two longitudinal septa, 
colored, .001 1 to .0014 in. long, ,0006 to .0008 in. broad. 
Dead stems of Arabis, California; M. E. Jones. 
Pyrenophora fenestrata. — Perithecia .011 to .015 in. broad, 
depressed, at first covered by the epidermis, then erumpent or t)e- 
coming naked, hispid with a few straight, divergent, black sette ; asci 
fugacious; spores oblong, fenestrate, deeply colored, black m tn 
mass, .0016 to .002 in, long, .0007 to .0009 in. broad, with about seven 
transverse septa, generally constricted in the middle. 
Dead stems of herbs. Utah; Jones. 
