161 
This species closely resembles the last, but is darker in color 
and the branches are more strict, with leaves more closely imbri- 
cate. Under the microscope it is readily distinguished by its very 
broadly auriculate branch leaves. 
2a. CLIMACIUM AMERICANUM KINDBERGII Ren. & Card. Bot. Gaz. 
15: 1890. 
C. Americanum fluitans Aust. Musc. Appal. 49. no. 289. 
1870. Name only. 
Stems decumbent, irregularly ramulose, often floating ; den- 
droid secondary stems rarely present; stem leaves scattering, 
ovate; branch leaves ovate-lanceolate, not auriculate, but clasping 
by enlarged rounded basal angles, seldom sulcate; areolation 
nearly uniform; median cells oblong-hexagonal, 2-3: 1. Seta 
usually much longer and more flexuous than in the species, 2-4 
cm. long ; teeth of peristome usually more or less perforate. 
In swamps, having the range of the species and extending to 
the Gulf. 
Typical form from Lafayette Woods, La. (Langlois). 
Hastings, Ontario and Gill River, Canada (Macoun) ; Dells of 
the Wisconsin (E. G. Britton); Cambridge, Mass. (F. Boott); 
Wellesley, Mass. (Miss Cummings); Conn. (Eaton); New 
York (E. G. Britton); Del. (A. H. Commons); New Jersey 
(Austin) ; River Swamps, Fla. (Chapman). 
Exsiccatr.—Austin Muse. Appal. 289; Ren. & Card. Musc. 
Am. Sept. Exsic. 238. 
The specimens of Sull. & Lesq. Musc. Bor. Am. Ed. 2, 42. 
in the Columbia College Herbarium are this variety as are also 
Drummond's Musc. Am. (S. States) 120. 
A. well-marked and interesting variety which would stand asa 
distinct species were it not for the gradations. Frequently the 
typical form found on the borders of a swamp will gradually 
change to the variety at the water's edge. The dendroid form, 
which is frequent in southern swamps, closely resembles C. den- 
droides in appearance and has often been confused with it. It is 
easily distinguished by its areolation and elongated capsules. Its 
typical habit is hypnoid and is well represented by Austin's exsic- 
cati. When growing out into the water it sometimes has the 
habit of a Fontinalis with distant leaves. 
