BARNES NORTH AMERICAN MOSSES. 357 



542. Hypnum Columbiae Kindb. Tufts dense: steins short, very tomen- 

 tose, irregularly branching; branches short: leaves narrower than in H. 

 chrysophyllum, from narrow ovate base gradually tapering into acumen; 

 borders denticulate all around, recurved at angles; areolation often wide 

 as in Amblystegium; costa reaching to acumen or sometimes longer; peri- 

 chaetial leaves short-acuminate: capsule generally smaller and shorter than 

 in H. chrysophyllum, curved; lid short-apiculate; peristome dark-yellow, 

 not pale. Mac. Cat. 224. On wet logs: British Columbia. 



543. Hypnum stellatnm snb-decursivulum Kindb. Leaves smaller, 

 decurrent, abruptly acuminate from a short ovate base; alar cells more 

 numerous: not found fruiting. Mac. Cat. 225. Growing with Dicranum 

 scoparium on earth in a swamp, Ontario. 



544 Hypnum polygamum longinerve R. & C. Leaves narrower, long 

 acuminate; costa stronger, extending into acumen: capsule paler, nar- 

 rower. Bot. Centralbl. 44: 423. 1890. Victoria; Vancouver Island. 



545. Hypnum polygamum fallaciosum Lindb. Larger, often strik- 

 ingly like H. aduncum Kneiffii in habit: costa very variable, forked, 

 longer or shorter, or wanting. Milde, Bryol. Siles. 346. 1869. 



546. Hypnum aduncnm pnngens H. Mull. Leaves erect, sub-imbri- 

 cate, apical ones inrolled at the point, short acuminate or subapiculate, 

 straight or a little curved. Renauld in Husn. Muscol. Gall. 387. 1894. 

 Yellowstone Park. 



547. Hypnum a dun cum attennatnm Boul. Slender, sometimes elonga- 

 ted: stem leaves short, deltoid, curved at point; costa with tendency to 

 bifurcate; branch leaves small, without auricles. Ren. 1. c. Deer Lodge, 

 Mont. 



548. Hypnum aduncum platyphyllum Kindb. Leaves very broad and 

 short acuminate. Mac. Cat. 226. On rocks in woods: Rockcliff, near Ot- 

 tawa, Can. 



549. Hypuum aduncnm RoeJlii Ren. Leaves distant, spreading, flex- 

 uous, apical oblong, then gradually long subulate acuminate, acumen 

 flexuous and twisted. Ren. ibid. 372. Yellowstone Park. 



550. Hypnum aduncum flexile Ren. Emergent, more slender: stems 

 flexuous: leaves usually narrower, flexuous or slightly homo+ropous pro- 

 longed into a twisted subula. Ren. ibid. 373. Vancouver; Hobart, Ind. 



651. Hypnum capillifolium Warnst. Dioicous: stem erect (5-15 cm.), 

 pinnate: leaves secund or falciform, oblong lanceolate, gradually narrowed 

 from the base, long subulate by the excurrent costa which is strong, 

 90-140/* wide at base, much thicker than the lamina; tissue delicate, basal 

 cells distinctly and long excurrent, alar dilated, forming large convex auri- 

 cles reaching almost to the costa. Ren. ibid. 379. Idaho; Washington; 

 Vancouver Is.; British Columbia. 



