— 52 — 



lb. Leaves slightly rough at apex; capsule inclined, ovoid, about 2-2.5 times 

 as long as wide. 



Swartzia inclinata"^ Hedw. — Calif.; Mont, to Utah and Colo.; north- 

 eastern N. Amer. 



Plate VII. — Swartzia inclinata 

 (i) Plant, XI. (2) Capsule, X22. 



3. Trichodon 



Stem slender, 3-angled. Leaves not crowded, not 2-ranked, sheathing, 

 reflexed, awned, serrulate. Calyptra cucullate. Seta slender. Capsule nar- 

 rowly ovoid or cylindric, straight or slightly curved; lid conic-rostrate; peristome 

 single; teeth 16, slender, papillose, bifid almost to base, thick-jointed. Spores 

 smooth. — (Gk. thrix = hair; odous = a tooth; referring to the long, thin teeth 

 of the peristome.) 



la. Seta 10-15 i^ini- long; capsule narrowly cylindric. 



Trichodon tenuifolius^ (Schrad.) Lindb. — Yukon to Wash , Nev. and 

 Mont. 



lb. Seta 5-7 mm. long; capsule ovoid-cylindric. 



Trichodon borealis Wms. — 'Known only from Dawson, Yukon. 



4. Ceratodon 



Plants matted together with rhizoids, green, not glossy. Stem 3-5 angled. 

 Leaves small, ovate-lanceolate, acuminate or subulate ; cells isodiametric. Calyp- 

 tra cucullate. Seat purple or yellow, slender. Capsule exserted, small, some- 

 what sulcate when dry, abrupt at base, with goitre; lid conic-rostrate; peristome 

 single; teeth 16, split nearly to base, nodose. Spores small. — (Gk. keras = a 

 horn; odous = a tooth; the teeth of the peristome suggested the horns of a goat.) 

 la. Leaf-vein usually not or hardly excurrent; seta purple; capsule from 

 inclined to horizontal, 2.5-3.5 times as long as wide exclusive of lid. 

 Ceratodon purpureus^ (L.) Brid. — Cosmopolitan, 

 lb. Leaf- vein strongly excurrent; seta yellow or red; capsule usually erect, 

 about twice as long as wide exclusive of lid. 



Ceratodon conicus'^ (Hampe) Lindb. — Alaska to Wash, and Idaho; 

 Minn. 



^ Distichium inclinatum B. S. G. 



^ Trichostomum tenuifolium Schrad; Trichostomum cylindriciim Hedw.; Trichodon cylindricus 

 Schimp. 



^C. heterophyllus Kindb.; C. columbiae Kindb. 

 "^Trichostomum conicum Hampe; Ceratodon minor Aust. 



