162 
Crimacium Rutuenicum Lindb. is not a Climacium. Its affin- 
ities are uncertain, but is it not one of the Isotheciaceae. It has 
been referred to Pleuroziopsis by Kindberg in his check list of 
European and American mosses (Can. Rec. Sci. 1894: 19, 1894.) 
He associates it with Hypnum splendens Hedw. and H. triquetrum 
L: This does not seem to be its natural alliance. 
HOMALOTHECIUM Br. & Sch. Bryol Eur. fasc. 46-47. 
1851. 
This genus is so closely allied to Camptothectum that it is 
clearly a violation of natural relationships to put it in another 
family. The nearly erect and symmetric capsule and the incom- 
plete peristome are the only characters associating Homalothecium 
with the Isotheciaceae. 
ISOTHECIUM Brid. Bryol. Univ. 2: 355, AX. zo. 1827. 
Schimper, Synopsis, Ed. 2: 662, separates /sothectum myosur- 
oides (L.) Brid. from the genus of which Z. myurum (Pollich) 
Brid. remains the type. Z. myosuroides clearly belongs to the Bra- 
chytheciaceae and all our American species are closely allied to 
it Thus we have no American species of /sothecium. 
BRACHYTHECIACEAE 
My studies in this family have been confined principally to the 
following genus. 
BRACHYTHECIUM Br. & Sch. Bryol. Eur. Fasc. 52—54. 
1853. 
Gametophyte generally large, never minute, prostrate or creep- 
ing, irregularly or subpinnately branching. Branch leaves pluri- 
seriate, acute to long-acuminate, usually concave, longitudinally 
plicate or sulcate; vein extending to the middle or beyond; 
median leaf-cells linear to linear-rhomboidal, length 5-15 times 
diameter (3—5:1 in B. reflexum); basal cells broader and shorter, 
alar quadrate. Stem leaves larger and broader ; paraphyllia none. 
Male branches gemmiform. Sforophyte with seta smooth to very 
rough, twisted to the right. Calyptra cucullate, smooth; capsule 
short, 2—4:1, inclined, arcuate (erect and symmetric in B. Utahense, 
B. acuminatum, B. splendens and B. biventrosum); more or less 
contracted under the mouth when dry ; operculum convex-conic 
