124 ' Best : Revision of the North American 



I. Heterocladium procurrens (Mitt.) Rau & Hervey, Cat. 38, 



1880 



Pterogonium procurrens Mitten, Journ. Linn. Soc. 8 : 37. pi. 



7. 1865. 



Heterocladium proewnbens Jaeg. and Sauerb. Adumb. 246. 



Hypnum {Heterocladiuni) procurrens L. & J. Mosses of N. A- 



321. I884. 



Heterocladium abcrrans Ren. & Card. Bot. Gaz. 15: 59. 1890. 



Plants rather stout, in spreading tufts, pale green to yellowish 

 green. Stems, with central strand, 4 to 8 cm. long, stoloniform, 

 pinnately branched ; smaller branches simple, attenuate ; larger- 

 branches (secondary stems) closely pinnate ; paraphyllia few, linear- 

 lanceolate, serrate: stem leaves scariose, distant, 1.4 to 1.8 mm. 

 long, .6 to .9 mm. wide ; from an erect, auriculo-cordate, subclasp- 

 ing base broadly triangular-ovate, abruptly subfiliform acuminate, 

 spreading-recurved, margins crenate-serrate, costathin, divided, one 

 branch longer, disappearing below the middle ; larger branch leaves 

 similar, not auriculate, subdistichous, spreading, gradually acute to 

 narrovvly acuminate ; smaller branch leaves ovate-lanceolate, lower 

 acute, upper obtuse ; cells of stem leaves smooth, clear, multiform, 

 those of central -basal area linear, obtusely pointed, .006 mm. wide, 

 4 to 6 times as long, the others broader and shorter, varying from 

 oblong-fusiform to oval-rhombic ; apical cells linear. Dioicous ; 

 perichetial bracts radiculose at base, whitish, outer broadly ovate, 

 inner subvaginant, from an oblong base, long narrowly acuminate, 

 serrate, flexuose-spreading, scarcely costate ; pedicels smooth, 

 flexuose, curved above, about 2 cm. long ; capsules reddish brown, 

 oval-oblong, asymmetric, horizontal, pachydermous, curved and 

 constricted when deoperculate ; urn 1.5 to 2 mm. long, 1 mm. 

 wide; exothecial cells thick-walled, oval-oblong; annulus broad, 

 deciduous ; exostomial teeth yellowish, margined, closely articu- 

 lated, confluent at the reddish base ; endostomial band scarcely one 

 half the length of the teeth; segments split; cilia 1 to 3, nodose; 

 operculum conic, apiculate ; spores smooth, .013 to .016 ; matures 

 in June ; on rocks, more rarely on roots of trees or the ground. 



Type locality, North America ; type in Hb. Mitten. British 

 North America, Drummond. 



Montana (Holzinger & Blake, Williams) ; Idaho (Leiberg 



• 



Washington (Allen, Roll) ; British Columbia (Macoun) 



Exsiccati : Ren. & Card. Muse. Am. Sept. 94 as 



//. 



aberrans. 



Macoun Can. Muse. 484 and 692 as H. homoeopt 



