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JOURNAL OF MYCOLOGY. 
[Vol. IV, No. 9 , 
cylindrical. Sporidia sublanceolate, continuous, brown, straight 
or curved, 16—18 x 3J. This seems to be a different thing 
from Sphaeria ramulosa Schw. which appears referable to Xylaria. 
IV. Placoxylon. —Stroma broadly effused. 
(a) Externally colored , not black. 
Hypoxylon perforatum, Schw. Syn. Car. No. 45.—On dead 
oak, maple, ash and other limbs. Common. Also on dead petioles 
of Sabal serrulata, Florida (Calkins). Stroma (On the bark or 
wood) superficial, effused or tubercular convex (2 — 4 mm), often 
interruptedly confluent for several cm. in extent, dark or purplish- 
rust color dotted with the minute, white-margined, punctiform 
ostiola. Conidial layer cinereous-white, pulveraceous. Conidia 
minute, ovoid or subglobose on short subsimple or branching 
hyphas. Perithecia submonostichous, globose small (£ — \ mm.), 
lying near the surface of the stroma, crowded, mostly not distinctly 
prominent. Asci cylindrical, 60—90 x 7—9 (p. sp.) with a long 
filiform base and overtopped by the filiform paraphyses, 8-spored. 
Sporidia obliquely uniseriate, ovate, with the ends mostly obtuse, 
nearly straight or subinequi lateral, dark-brown 10—14x5—7. 
Bears a general resemblance to R. rubiginosum,. 
Hypoxylon rubiginosum, (Pers.) Syn. p. 11.—Fr. Summ. Veg. 
Scand. p, 384. On decorticated limbs of various deciduous trees. 
Common in this country and in Europe. Around Newfield, N. J., 
mostly on Acer and Quercus. On beech and Liriodendron, Penna. 
(Everhart). On warious dead limbs, Fla. (Calkins). Stroma 
* mostly broadly effused, but also occurring in small patches 
(2—4 mm. across), bright ferruginous-red, finally black, tolerably 
thick (1—2 mm.), surface nearly even or distinctly mammillose 
from the projecting perithecia. Conidial layer pulverulent, thin, 
at first dirty -olivaceous-yellow, then bright ferruginous. Conidia 
obovate or oval, very small, acrogenous on short, sparingly 
branched sterigmata. Asci cylindrical, long pedicellate, 8- 
spored with slender filiform paraphyses, 60 x 6 micr. (p. sp). 
Sporidia monostichons, ovate, inequilateral, or nearly straight, 
dark brown, 10 x 15 micr. The perithecia appear first in the 
middle of the stroma and spread towards its margin which thus 
remains for some time sterile. The perithecia are larger than in 
H. 'perforatum and more evenly effused and. the stroma is of a 
brighter color. At first and around the margin of the stroma the 
perithecia stand quite separate but they are finally closely packed. 
Hypoxylon subchlorinum, Ell. & Calkins.—On bark of dead 
limbs of some deciduous tree. Florida. (Calkins Nos. 55 and 
139). .Stroma suborbicular, thin (1 mm.) flat \—1 cm. diam. 
