CL. XXIV.] 38. cixc. roxTiXALioiJ)i:s. 4,53 



less readily be confounded with Fmitinalis cmtipi/rctica^ wliicli 

 grows almost in all running waters, but is distinguished by 

 its triple direction, by its want of nerves, and by the some- 

 what keel-shaped nature of its leaves, whitli are also much 

 larger, and more remote. The capsules are envelo})ed by 

 short round scales : the peristome consists in a trellis- 

 shaped net. The olher aquatic mosses are still less similar. 

 Hypnum fluitans L. is distinguished by very small leaves, 

 separate from one another and alternating ; by long iVuit- 

 stalks, and by a double peristome ; H. ruscifbrium Neck, by 

 its ovate, serrated leaves, the nerves of which extend almost 

 to the point, by its long petiolated nodding capsules ; H. ri- 

 parium, by the fibres which every where proceed Irom the 

 axilla? of the leaves ; H. JluviatHe Hedw. almost solely by its 

 peticlated capsules with a double peristoma. 



The genus Ciiididotus, first estabislied by Falisot-Beau- 

 vois, and admitted by Hooker, stands Ix^tween Tricliostommu 

 and Barhiila. From the former, with which this moss used 

 to be classed, it is distinguished by having the teeth of the i)e- 

 ristome united below, and twisted above. Barbiila is distin- 

 guished by this circumstance, namely, that the twisled cilia of 

 the peristome are tender, and must be considered merely as 

 prolongations of the internal membrane of the capsule. The 

 calyptre, too, is laterally divided. 



Synonyracs and Fignrc^^ 



FontinaUs minor lucens, J. Bauli. Hist. 3. 770. Foliis trir 

 angularibus minus complicatis. Rat Syn. p. 79. Trian- 

 gularis minor carinata. Dill, Hist. Mksc. p. 257. t. 33. f 2. 



Muscus aquaticus frutescens pinnatus, Moris. 3. p. G^G. s. 15. 

 t. 6. f. 32. 



Muscus squamosus, fohis acutissimis, in aquis nascens, Tourn. 

 Inst 554. 



Fontinalis minor, Liini. Sp. PL 1571. Ed. Ueich. 4. 452. 

 Gunner, Fl. Norv. n. 969. t. 3. f 2. Eng. Bot 557. 



Hypnum, Hall Stirp. Helv. n. 1795. 



Hypnum nigricans, Vill. Dclph. 3. 905. 



Tnchostomum fontinalioidcs, Iledic. Stirp. Crypt. 3. t. 14. 



