HyPocoPRA 95 
Hypoxylon equorum Fuckel, Fungi Rheniani,* no. 1058. 
Serdaria equorum (Fuckel) Wint. Abhand. d. Naturforsch. 
Gesel. zu Halle, 13: 77-78. M. 7. f. 2. 1873. 
Coprolepra equorum Fuckel, Symbol. Mycol. 240. 1869. 
Perithecia scattered and sunken beneath a thin black corky 
effuse widely spread villous stroma which often becomes smooth 
in age, 350—500 / in diameter, thin, membranaceous and com- 
pletely invested in a dense feltwork of white mycelium which be- 
comes differentiated into the stroma above, subglobose, with a 
short black shining papilliform ostiolum which extends through 
the stromatic covering. 
Asci 8-spored, cylindrical, broadly rounded above and con- 
tracted below into a short blunt stipe, 20-25 u x 200-2254; 
apical apparatus of ascus staining either blue or brown with iodine : 
paraphyses filiform, septate, hyaline, longer than the asci and mixed 
with them. 
Spores obliquely uniseriate, ellipsoid to slightly inequilateral, 
subacute to rounded, usually more acute below than above, 
12-144 x 24-29 p, ranging from hyaline when young through 
yellow to dark brown and opaque ; germinal groove lateral, one- 
third the length of spore, surrounded by a gelatinous covering 
which swells greatly when placed in water. (77. zr. f. 1-4 and 
8-11; Pl. rg. f. 17-18.) 
Distinctive character: The thin effuse stroma. 
Dry specimen: On horse dung, Hermosa, Col., March 1899 
(Baker, communicated by Earle). 
Cultivated specimens: On horse dung, Aberdeen, S. D., Sept. 
1899 (Towne); horse and cow dung, Brookings, S. D., Nov. 
1899 (Carter); horse dung, Rooks Co., Kan., Aug. 1899 (Bar- 
tholomew); horse dung, Summit, Mont, Aug. 1900 (Griffiths 
& Lange). 
The stromatic characteristics are very variable in both Ameri- 
can and foreign specimens. Occasionally the stroma forms a 
convex mass about each perithecium thereby making the whole 
structure appear papillate; more often the stroma is roughened 
only by the minute black papilliform beaks. The papillate char- 
acter was very pronounced in the Colorado specimens where the 
perithecia were often imbedded in individual stromata as represented 
in the figures. Indeed, Professor Earle and myself at one time 
considered the Colorado specimen to be a distinct species; but 
* Reference taken from literature, original not seen, 
