174 BRTACE^. [Orthotrichum. 



ally longer from the base upward, oblong-lanceolate, apiculate at 

 the blunt apex, the borders revolute ; areolation cora2:)aratively 

 loose, the upper cells round, granulose and mhiutely pajjillose, 

 the lower quadrate near the borders, quadrangular-oblong near 

 the costa : calyptra large, naked : capsule subimmersed, broadly 

 oval or globose, cylindrical-oblong when empty, thin, with a thin 

 whitisli ej)icarp, not striate nor plicate ; lid plano-convex, obtuse ; 

 teeth 16, geminate, granulose ; cilia 8, short, very slender. — 

 Trans. Amer. Phil. Soc. xiii. 110; Sulliv. & Lesq. Muse. Bor.- 

 Am. Exsicc, ed. 2, n. 180 ; Sulliv. Icon. Muse. Suppl. 68, t. 50. 

 0. jyusillum, Mitt. Journ. Linn. Soc. viii. 25? 



Hab. Pennsylvania, on poplars, and Massachusetts {James) ; South 

 Carolina {Bavenel). Early spring. 



A very fine distinct species. 0. piisilhnn, Mitt., is described as having 

 the capsule 8-plicate when dry. This does not agree with the characters 

 of O. psilocarpiun, but specimens communicated by the author do not 

 differ. Specimens of O. psilocarpum, with a description, were distributed 

 by James as early as 1858. 



24. O. exiguum, Sulliv. Plants extremely small, in loose 

 dark green tufts; stems five m.m. long, simple or fastigiate- 

 branching: leaves linear-oblong, obtusely acuminate, open, erect, 

 slightly recurved on the borders, punctiform-areolate and mi- 

 nutely papillose in the upper part ; basilar cells loose, quadran- 

 gular or quadrate-oblong : flowers dioecious; male plants gemmi- 

 form, terminal in smaller plants than the fertile : calyptra naked, 

 or rarely with a few appressed hairs : capsule subimmersed, 

 oblong-oval, broadly and obscurely costate, truncate at the 

 broad orifice ; lid hemispherical-apiculate ; peristome double, 

 the outer of 16 geminate teeth, the inner of 8 lanceolate cilia, 

 broader than the teeth, white, punctulate, composed of a double 

 series of cells. — Mosses of U. States, 33, and Icon. Muse. 55, 

 t. 35. 



Hab. Base of trees, Santee Canal, South Carolina [Bavenel), 



***** Outer peristome of 16 teetJi, the inner of S or 16 

 cilia ; capsule not ribbed, smooth lohen dry : plants large : 

 floioers monoecious. 



25. O. leiocarpum, Bruch & Schimp. Plants of medium 

 size, loosely fasciculate, cespitose : leaves oj^en, recurved when 

 moist, ovate at base, long-lanceolate above, the borders revo- 

 lute, and surface papillose : calyptra campanulate, Avith fcAV 

 hairs: caj^sule short-pedicellate, immersed, its collum defluent 



