170 BRYACE^. [Orthotrichum. 



13. O. Hallii, SuUiv. & Lesq. Plants small, loosely cespi- 

 tose; stems simple, divided by basilar innovations: leaves 

 spreading, linear-lanceolate, blunt at the apex ; borders revo- 

 lute from the base to the middle ; upj^er areolation dense, with 

 round papillose cells; perichretial leaves similar: calyptra large, 

 sliohtly hairy, covering the capsule to its base: capsule sub- 

 immersed, oval, on a short thick pedicel entirely covered by the 

 tube of the vaginule, distinctly 8-costate when dry and slightly 

 contracted under the orifice ; lid conical, apiculate ; teeth 

 whitish, in pairs, vermiculose ; cilia shorter, slender, fugacious. 

 — Sulliv. Icon. Muse, Suppl. 63, t. 45. 



IIab. On trees; Rocky Mountains {E. Hall). 



14. 0. SOrdidum, Sulliv. & Lesq. Plants short, loosely 

 cespitose, brownish green : leaves close, spreading, the upi3er 

 open, erect, lingulate-lanceolate, gradually narrowed to the 

 aj^ex, reflexed or revolute on the borders, irregularly quadrate- 

 areolate and papillose in the upper part; basilar cells quad- 

 rangular, longer and linear near the costa: calyptra slightly 

 villous : capsule immersed, obovate, defluent from a slightly in- 

 flated short coll am to a short pedicel, plicate-costate when dry, 

 enlarged at the orifice ; lid convex, short-beaked ; teeth bigemi- 

 nate, broadly perforate from the middle upward along the 

 dividing line ; cilia 8, smooth, nearly as long as the teeth, of a 

 double row of cells, enlarged at base. — Aust. Muse. Appal, 

 n. 168 ; Sulliv. Icon. Muse. Suppl. 67, t. 49. 



Hab. On trees, generally in wooded swamps; Massachusetts {Lesque- 

 reux, James); New York (Austin). 



15. O. Kingianum, Lesq. With the aspect of 0. Icevi- 

 gaticm, from which it differs in the leaves merely reflexed on 

 the borders, not revolute, with the basal areolation longer and 

 narrower, the calyptra with thin scattered hairs, the capsule 

 scarcely emergent on a shorter pedicel, longer, cylindrical Avhen 

 empty, the peristome double, the inner of 8 stout cilia, com- 

 posed of a double series of cells. — Mem. Calif. Acad. i. 18 ; 

 Sulliv. Icon. Muse. Suppl. 74, t. 55. 



Hab. On rocks, near the Falls of the Yosemite (Bolander). 



* * * Plants small, one cm. lo7ig, or less. 



16. O. Ohioense, Sulliv. & Lesq. Plants more or less 

 widely cespitose, yellowish green above, dirty brown within ; 



