[Vor. 7 
210 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
menium even or somewhat tubercular, pallid neutral gray; 
in structure 200-300 y thick, composed of ascending, densely 
interwoven hyphae both colored and hyaline, the former 33 u in 
diameter, with the tips arranged side by side in colored subhy- 
menial zones, mark the 1-3 strata finally present; cystidia 
incrusted, cylindric, 30-60 X 8-20 u, sometimes protruding up to 
20 y beyond the hymenium, starting from all parts of the fructi- 
fication; spores hyaline, even, 5-7 X 11-21 y. 
Fructifications 1-23 mm. in diameter, reflexed 1-2 mm. 
On dead limbs of alder, chestnut, willow, and other frondose 
species. Rhode Island to Alabama and westward to Washing- 
ton and Oregon. March to January. Occasional. 
S. erumpens combines the characters of S. versiforme and 
Peniophora cinerea; it is more constantly and distinctly reflexed 
than S. versiforme, always has a gray hymenium, and has quite a 
different mode of origin from the latter. In the type small 
blackish bodies burst out from the bark, open at the tip, dis- 
closing whitish hymenium, and then grow to mature condition. 
Specimens at hand do not show how such a large resupinate 
fructification as that collected by E. T. and S. A. Harper, No. 
819, cited below, does arise, and I may be wrong in referring the 
specimen to S. erumpens. An important microscopical detail of 
S. erumpens is the narrow olivaceous zone of colored hyphal tips 
at the very base of the basidia of the hymenium. 
Specimens examined: 
Exsiccati: Ellis, N. Am. Fungi, 720, under the name Corticium 
quercinum var. scutellatum. 
Rhode Island: Lincoln, F. W. Collins. 
New York: East Galway, E. A. Burt; Ithaca, C. J. Humphrey, 
2568 (in Mo. Bot. Gard. Herb., 20784); Karner, H. D. 
House (in N. Y. State Mus. Herb. and Mo. Bot. Gard. 
Herb., 55210); New Scotland, C. H. Peck (in N. Y. State 
Mus. Herb., T 28, and Mo. Bot. Gard. Herb., 54658). 
New Jersey: Newfield, J. B. Ellis, in Ellis, N. Am. Fungi, 720. 
Maryland: Takoma Park, C. L. Shear, 959. 
District of Columbia: North Takoma, C. L. Shear, 1043, type. 
Georgia: Raleigh, R. M. Harper, 2037b, comm. by P. L. Ricker, 
and (in N. Y. Bot. Gard. Herb. and Mo. Bot. Gard. Herb., 
42597). 
