-48- 

 radial walls are rarely thickened so as to appear in any way; the 

 divisural line shows the place of their attachment to the teeth and 

 segments. 



NEW AMERICAN MOSSES. 



Hypnum (Cali.iergon) Cyclophyllotum Holzinger, Minne- 

 sota Botanical Studies, Nov., 1896, pi. jg. 



"Plants dark green above, yellow below; 8-iQcm. high; erect 

 by crowding. Stem leaves concave, ascending when moist, as 

 broad as long, or broader, obtuse, entire margined, costate to apex ; 

 costa broad ; leaf angles decurrent, strongly excavate, their cells 

 abruptly enlarged, hyaline, 0.08-0. imm. xo.025-o.04mm., the 

 thin walled cells not quite reaching the costa; upper leaf cells 

 0.04-0. o6mni. X 0.008-0 oimm.; branch leaves, of the .short axillary 

 branches, also concave, much smaller, the costa faint, not ex- 

 tended into the obtuse apex. Dioicous ; antheridial buds numer- 

 ous along the middle part of the stem, shorter than the leaves, in 

 their axils. Fruiting plants not found. 



' ' This plant is near Hypnum cordifoliutn, but differs from this 

 species in having its leaves more closely set on the stem, costate to 

 apex, and muth wider in proportion to length ; also in having the 

 larger cells of the auricles abruptly enlarged, and the leaf cells 

 proper smaller. 



"It dirt'ers from Hypnum gigatttcum in its unusually broad 

 leaves, smaller size, dark green color, and fewer and shorter 

 branches." 



Collected in Lamoille "Cave," Minnesota; associated with 

 Brachytheciuni rivulare. 



Grimmia (Eugrimmia) Brittonni.i? R. S. Williams, Bull. Torr. 

 Bot. Club, 27: 316. //. ig. 1900. 



"Growing in dense hemispherical tufts up to 3.5cm. high. 

 Stems slender, usually bearing long branches. Outer perichaetial 

 and upper stem leaves with blade imm. in length, oblong, some- 

 what lanceolate pointed, concave, flat on the borders with a nearly 

 smooth hair point up to three times the length of blade ; lower 

 leaves a little smaller with hair point scarcely equaling blade, 

 more concave and somewhat recurved ; inner perichictial leaves 

 minute, triangular, with hair point eight to ten times length of 

 blade ; upper cells irregular, roundish or quadratic, about o.oo6mm- 

 in diameter, gradually becoming elongated below, towards the 

 base three or four times longer than broad near the costa and 

 one and a half to two times longer than broad near margin ; cells 



