[Vor. 5 
196 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Oregon: White Pine, J. R. Weir, 398 (in Mo. Bot. Gard. Herb., 
16266). 
Jamaica: Cinchona, F. S. Earle, 417, N. Y. Bot. Gard., Plants 
of Jamaica. 
9. А. acerinus (Pers.) v. Hohn. & Litsch. K. Akad. Wiss. 
Wien Sitzungsber. 116 : 804. pl. 2. f. 6. 1907; Bourd. & Galz. 
Soc. Myc. Fr. Bul. 28 : 352. 1913. 
Corticium | acerinum Persoon, Obs. Мус. 1:37. 1796; 
Romell, Bot. Not. 1895 : 71. 1895.—Thelephora acerina Per- 
soon, Syn. Fung. 581. 1801; Мус. Eur. 1:152. 1822; Fries, 
Syst. Мус. 1:453. 1821; Hym. Eur. 648. 1874.—Sterewm 
acerinum (Pers.) Fries, Еріст. 
X 554. 1838; басс. Syll. Fung. 6: 
< 587. 1888. 
Fructifications scattered, re- 
supinate, crustaceous, adnate, 
thin, even, white, the margin 
abrupt; in structure 45-80 д 
Vertical be viae ut ructification thick, consisting of densely M 
showing scattered immature basidia ranged, hyaline, thin-walled, 
and аһвепсе of gloeocystidia, X92; suberect hyphae about 2-3 p in 
moval of the granular matter by diameter, heavily inerusted, 
шеш rising between the basidia to 
the surface and terminating in a racemose manner with short, 
slender branches, loaded with crystalline matter; basidia 
clavate, 30-456 и; spores hyaline, even, 10-12 6-7 y. 
Fructifications about 3 mm. in diameter, rarely elongated 
up to 10 mm. long, 3 mm. broad. 
On. bark of trunks of living maple, oak, ete. Vermont to 
Texas, westward to Missouri, and in Cuba and Mexico. 
Throughout the year. 
This species may be recognized by its occurrence in scat- 
tered, small, white, circular or oblong fructifications on the 
bark of trunks of living white oak, maple, elm, ash, ete. The 
smaller spores, racemose paraphyses, and absence of gloeo- 
eystidia are structural characters separating the species from 
A. seriatus and A. nivosus. Our American collections are 
