TWENTY-SEVENTH ANNUAL MEETING. 179 



Leaves very short acuminate, glossy, not decurrent x H. rivulare Bruch 56 



Leaves gradually acviminate, autoecious H. rutabulum Linn. 52 



Lid (more or less long) rostrate; leaves acute or acuminate; cilia 

 2-3; leaf points not filiform. 

 Leaves serrulate all around; not decurrent nor excavate; acute 



segments perforate x H. praelongum L. 75 



Leaves entire at base; lid nearly as long as capsule * H. hians Hedw. 77 



b. Seta smooth. 



i. Lid (more or less long) rostrate. 

 Leaves apparently two ranked; plants of dry woods, * H. serrulatum Hedw. 89 

 Leaves spreading every way, ovate, acute, rarely slender- 

 pointed; in water * H. rusciforme Weis. 90 



Leaves deltoid, with long, slender points; points straight; 



spreading branchlets attenuate H. strigosum Hoffm. 70 



ii. Lid convex to conic. 

 * Leaves acute or acuminate, serrulate. 

 Capsule symmetric, erect. 



Dioecious, large ( branches 3-4 cm.) * H. acuminatum Beauv. 36 



Capsule unsymmetric, inclined. 



Capsule short (1:1.5) monoecious; leaves straight when drv, 



* H. salebrosum Hoff. 37 

 Stems long; leaves shorter, and short acuminate, indistinctly 



serrate H. salebrosum, var. longisetum B. & S. 



Capsule longer (1:3) dioecious; leaves straight wheii dry. . . . 



* H. laetum Brid. 35 

 Leaves short, broader, more strongly dentate and more loosely 



areolate H. laetum, var. dentatum Lesq. & James 



* * Leaves acute or acuminate, entire. 

 t Capsule strongly constricted under mouth when dry. 

 Leaves widest just at base, tapering equally; concave, smooth, 



cells plain * H. polygamum Wils. 132 



Leaves widest above base, long-acuminate * H. chrysophyllum Brid. 30 



t t Capsule slightly or not constricted; plants whitish, yellowish or 

 bright green; cilia 2; Monoecious, leaves open, 



H. salebrosum Hoffm. 37 

 2. Costa very short, or none or double. 



a. Alar cells, abruptly enlarged, often inflated and colored. : 

 Leaves not falcate, filiform-acuminate; alar cells few, large 



orange; plants stout, 7-10 cm. long; leaves quite 



entire * H. stellatum Schreb. 131 



b. Alar cells scarcely different, or quadrate, not abruptly enlarged. 

 Leaves complanate; lid rostrate; leaves not undulate, quite entire, 



H. sylvaticum Huds. 109 



Leaves serrulate to base, bicostate; annulus large * H. geophilum Aust. 87 



Leaves equally spreading; capsule inclined or horizontal, often 

 arcuate, and smooth when dry; leaves squarrose; 



abruptly long-acuminate * H. hispidulum Brid. 129 



II. Leaves secund. 

 A. Costa single, reaching to middle or beyond. 



Cells elongated; seta rough; leaves entire H. plumosum ? Swz. 58 



Seta smooth; leaves not rugose, often jjlicate; paraphyllia none: annulus large. 



Dioecious, leaves striate; teeth brown or dark orange, bordered; alar cells 



pellucid * H. aduncum Hedw. 132 



