BARNES — NORTH AMERICAN MOSSES. 329 



lanceolate, obtuse, denticulate at summit, rarely almost entire; alar cells 

 dilated, oblong, yellowish or sub-hyaline, forming distinct auricles; others 

 narrow, linear, sub-flexuose, attenuate, walls rigid and thickened; upper 

 perichsetial leaves sub-orbicular, broadly rounded or sub-apiculate at sum- 

 mit, not lacerate: capsule immersed, narrow, cylindrical; lid conic, ele- 

 vated, acuminate; peristome purple, teeth narrowly linear acuminate, 

 strongly papillose, lamellse 13-16, middle line scarcely apparent; cross bars 

 of endostome imperfect, cilia very muricate, united only at summit. 

 Monog. des Fontin., 1. c, 95. — Virginia. 



389. Pontinalis involuta Ren. & Card. — Plants slightly rigid or soft, 

 dirty green or yellowish: stems finally naked at base, much divided, pin- 

 nate; branches spreading or erect-spreading, distichous, obtuse or cuspi- 

 date, generally compressed: leaves quite crowded, rigid, erect-spreading, 

 oval oblong, oblong-lanceolate or sub-linear, very concave, strongly inflexed 

 at border, canaliculate, generally cucullate at apex, terminated by a broad 

 short obtuse or sub-acute slightly denticulate acumen; cells of angles 

 dilated, oblong or sub-hexagonal, brown or yellowish, forming distinct 

 auricles; others linear, narrow, walls delicate or slightly thickened; fructi- 

 fication unknown. Monog. des Fontin., 1. c ., 96.— Louisiana; Florida; 

 New Jersey. 



390. Fontinalis nitida Kindb. & Arn. — Plants soft, lax, delicate, gen- 

 erally somewhat shining above, yellowish green, dark below, becoming 

 black when old: stems delicate, flexuous, more or less naked below, branch- 

 ing; branches long, erect-spreading, more or less cuspidate: leaves scattered, 

 erect-spreading, plane or slightly concave, oval lanceolate or oblong lan- 

 ceolate, gradually narrowed, acuminate, acute or sub-obtuse, entire or 

 sinuolate at the apex; cells of angles dilated, oblong, sub-rectangular or 

 ■sub-hexagonal, yellowish, forming small auricles; the remainder, elongated 

 linear-rhombic with delicate walls; upper perich»tial leaves oval sub-orbic- 

 ular, rounded or sub-apiculate, finally a little lacerate at summit: capsule 

 immersed, small, oval, rounded at base; lid short conic; peristome reddish 

 orange, teeth narrowly linear, often cohering in pairs, papillose, generally 

 not perforate along middle line; cross bars of endostome perfect, strongly 

 muricate, almost spinulose. Monog. des Fontin., 1. c, 103. — On rocks 

 and trunks of trees at the edge of water: British Columbia. 



391. Fontinalis tenella Card. — Plants soft, very delicate, pale yellow- 

 ish green: stems delicate, more or less naked at base, divided in elongated 

 branches, sub-simple: leaves erect-spreading, soft, plane, narrowly lanceo- 

 late, very long and gradually acuminate, acute, entire or sinuate at sum- 

 mit; cells of angles dilated, oblong or sub-rectangular, yellowish or green- 

 ish, forming small auricles; others narrow, linear, walls delicate; upper 

 perichaetial leaves broadly oval or sub-orbicular, rounded, generally small 

 apiculate and finally lacerate: capsule immersed, small, oval or oblong, 



