Il6 FOXTINALACEAE 



Key to Genera 



Leaves cultriform, costate in our species Homalia 



Leaves ecostate Neckera 



HOMALIA (Bricl.) B. & S. 



Leaves costate and capsule long-exserted. 



H. Jamesii Schimp. Hamden, Bry. Ct. 



NECKERA Hedw. 



Plants usually large (excl. gracilis), growing on trunks of trees 

 or rocks; primary stems creeping, often stoloniferous; secondary 

 stems erect to pendent, often pinnately branched, usually com- 

 planate-foliate; stems and branches sometimes flagelliform ; 

 leaves often transversely undulate, ovate-lanceolate to oblong 

 or Ungulate, frequently unsymmetric, ecostate or nearly so; 

 leaf cells broadly rhomboidal at apex and upper margins, chang- 

 ing to linear-oblong to linear-flexuose at base; capsules immersed 

 or exserted ; peristome double, the inner a short membrane with 

 short segments or with segments longer and narrowly linear, 

 cilia wanting; annulus lacking. 



Key 



I — Leaves ovate-lanceolate, undulate, acute pennata 



Leaves oblong, not undulate, rounded at apex, often apiculate; 

 plants filiform gracilis 



N. pennata (L.) Hedw. Closter, N. J., Austin, Bx!; "On 

 trees and rocks, common," Muse. App. 255. 



N. gracilis (James) Kindb. {Homalia gracilis James). 

 "L T nder overhanging rocks, Palisades, N. J.," Muse. App. 257. 



FAMILY 26. FONTINALACEAE. WATER MOSSES 



Aquatic, floating, usually slender, attached at base of stems only, 

 often very long, dark to blackish green, especially below. Cen- 

 tral strand lacking in the stems. Leaves ecostate in Fontinalis, 

 costate in Dichelyma, mostly decurrent, entire or slightly den- 

 ticulate at apex; leaf cells rhomboid-hexagonal to linear-flexuose, 

 broader and shorter at base of leaf and often at apex also. 



