BARNES — NORTH AMERICAN MOSSES. 247 



II. Leaves seeund. 

 A. Costa single, reaching to the middle or beyond. (B on p. 248.) 



1. Leaves transversely rugose and longitudinally 



plicate H. aduncnm gracilescens, 381. 



2. Leaves not rugose, often plicate. 



* Paraphyllia abundant (rarely few). 



Ijeaves plicate H. commntatum, 387. 



Xieaves not plicate . 



Smooth H. filicinum,! 386. 



Very papillose H. decipiens, 561. 



* * Paraphyllia none.^ 



•)— Annulus none. 



Leaves quite entire, short acuminate . . . H. palustre, 398. 



JLeaves denticulate, subulate acuminate . . . H. fluitans,^ 383. 



■1— •)— Annulus present, often large. 



lieaves acute or bluntish H. ocliracenm, 401. 



Leaves subulate by the long excurrent costa . H. capillifoliuni, 551. 

 Leaves gradually long acuminate, costa often entering 

 point but not long excurrent. 

 Broad (1-2 mm.), crumpled and plicate when dry H. lycopodioides,*385. 

 Narrower (0.5-1 mm.), not crumpled when dry. 

 Auricles none or indistinct. 



Leaves usually plicate and denticulate. 

 Capsule oblique, incurved, subcylindric H. unciDatum, 382. \ 



Capsule symmetric, erect, cylin- 



dric . . . H. uncinatnm symmetricum, 55S. 



Leaves entire. 

 Plicate, plants pale green or shining yellow H. vernicosnm, 385. 

 Smooth, plants brown or purple or blackish H. rerolvens, 384. 



1 See Appendix, no, 560. 



^ H. conflatum C. M. & Kindb., Appendix, no. 558, belonging to tbis division, is not 

 ■sufficiently described to enable me to determine its position. 



' Including H, exannulatum Quemb., sec. Eenauld in Husnot's Musool. Gall. 379. See 

 also Appendix, nos. 553-557. 



* Including fl^. Wilsoni Sch, (JT. Sendtneri Wilsoni Sob.) as a sub-species, sec. Ren- 

 auld, ibid. 375. 



