20 
superficial, orbicular, or subelliptical, J-l cm . diam., concave, aud often 
with a thin, erect, rather broad margin, rufo-cinereus at first, finally 
black; disk mammillose from the projecting ostiola. Perithecia monos- 
tichous, immersed, ovate oblong S/b long, crowded, often subangular 
from mutual pressure. Asci cylindrical, subsessile, 8-spored, 110-120/* 
by 8/*, with long filiform paraphyses. Sporidia obliquely 1 seriate, 
narrow ovate, obtuse, subinequilateral, dark brown, 11-14/* by 4-5/* 
(15-16/* by 6-7/*, Sacc. in Syll.). Distinguished from N. discreta by its 
mammillose disk and differently shaped sporidia. 
Nummulaeia excavata,* (Schw.), Syn. N. Am. 1250. On bark 
of different species of Primus , Bethlehem, Pa. (Schweiuitz). Bather 
rare. Elliptic orbicular, l-2 cm . across, surrounded and margined by 
the raised but not radiately fissured epidermis. Disk deeply concave, 
black, puuctulate, with many minute scattered depressions, in the bot¬ 
tom of which are the ostiola. The stroma is included in a peculiar 
black cup-shaped receptacle, which penetrates to the wood, and is filled 
in the lower part with a woody pseudo-stroma (altered substance of 
the bark), the upper part being the true stroma, in which nestle the 
rather large pyriform scattered perithecia, occupying the central part and 
attenuated above into a black shining neck. Sporidia short elliptical, 
dark brown, 11.5-015.3 by 009.6-001.5/*. Allied to the preceding 
species, but more rare. 
Nummulaeia subconcava, (Sciiw.), 1. c. 1251. On branches of Vi¬ 
burnum dentatum, Bethlehem, Pa. (Schweiuitz). Gregarious and often 
confluent, erumpent |-J cm across, surrounded by the ruptured epider¬ 
mis, and consisting of a black crustaceous shell, inclosing the few rather 
large globose-depressed perithecia, connected by a very scanty stroma. 
Disk subconcave, subrugose, and black. Ostiola globose-papillate, 
elevated, few, black, sometimes confluent, connected by a very short 
neck with the perithecia, which have the ascigerous nucleus white. 
Sporidia oblong, light yellowish-brown, 15.3-019.2 by 005.76-007.6/*, 
some of them slightly constricted in the middle but not septate. 
B.—STEOMA CONVEX.f 
Nummulaeia Bulliaedi, Tul. Sel. Carp, ii, p. 43. Hypoxylon num- 
mularia, Bull. Champ, tab. 468, fig. 4. Sphceria clypeus, Schw. Stroma 
at first covered by the epidermis, soon emergent, almost superficial and 
free, convex, orbicular or oval, rarely of irregular shape, sometimes 
broadly effused, black inside and outside, puuctulate from the slightly 
*We are indebted to our friend W. C. Stevenson, jr., who furnished the measure¬ 
ments of the sporidia in this and the next species, from an examination of the orig¬ 
inal specimens in the Schweinitzian Herbarium in the Academy of Natural Sciences 
in Philadelphia. 
t Were we to rewrite this synopsis we would leave this section (B) of Nummularia 
in Hypoxylon, where it was formerly included, the difference being too slight to have 
any real generic value. 
