184 
rudimentary or none; spores minutely roughened, 12-16%, 
maturing in autumn. 
. Type locality, Lancaster, Pa. (Muhlenburg). 
On decaying wood, bases of trees, rocks and earth, in woods 
or shady places. Eastern North America west to Minnesota, 
south to Missouri and Louisiana ; not rare. 
ILLUSTRATIONS.—Sull. Icon.’ Musc. AM. 776, Hedw. l. c.; 
Hampe, Icones Musc. 7/ 7. 
ExsiccATi.—Drumm. Musc. Am. (S. States) 124 (Leskea 
sefosa var.) 125 (L. setosa), 126 (L. acuminata); Sull Musc. 
Allegh. 72; Sull. & Lesq. Musc. Bor. Am. (Ed. 1) 330, (Ed. 2) 
491, 492 and 493; Austin| Musc. Appal. 310; Macoun, Can. 
Musc. 282 i 
This species is very variable in width of basal membrane, width 
of segments, shape of leaves and length of acumination, but no 
one of these variations seems to be correlated with any other. 
Hedwig's type has lanceolate branch leaves, becoming broadly 
lanceolate below ; basal membrane of médium width; the plants 
are small and slender, leaves serrulate above and more contracted 
at base than usual. The form ordinarily distributed as the species 
corresponds to Hedwig's setosa, but the two cannot be distinguished 
except as extreme forms of one species. The leaf of acuminata 
figured by Hedwig must be a stem leaf, as the branch leaves of 
his type are lanceolate. The varieties of the Musc. Bor. Am. of 
Sull. and Lesq. do not correspond with the original plants. 
14a. BRACHYTHECIUM ACUMINATUM RUPINCOLUM (Sull. and Lesq.) 
Ren. & Card. Rev. Bryol. 20: 17. 1893. 
Hypnum acuminatum rupincolum Sull. and Lesq. Mosses of 
North America, 336. 1884. 
Leskea rupincola Hedw. Sp. Musc. 227. pl. 54. 
Characterized by an extremely narrow basal membrane. 
Probably having the range of the species but found most fre- 
quently in the southeastern United States. 
Var. FILIFORME E. G. Britton, Mem. Torr. Bot. Club, 4: s: 
1893, is not a Brachythecium. 
I5. BRACHYTHECIUM SPLENDENS Aust. Bot. Gaz. 2: 111. 1877. 
Brachythecium acuminatum deemed Ren. & Card. Bot. Gaz. 
14100. F860. 
