62 



FAMILY I. PLEUROCARPI, Bridel. 



Sporangium lateral, springing from the axillary or subaxil- 

 lary bud. 



A. EUPLEURO CARPI. Truly pleurocarpous ; vaginula, except in 

 Anoectangium, more or less confluent with the perichatial branch. 



ORDER I. FONTINALE1, Br. et Sch. Mont. 



Aquatic, attached at the base, floating above. Sporangium 

 nearly sessile, immersed amongst the perichsetial leaves. 

 Perichsetial branchlets not rooting at the base. Peristome, 

 when present, double ; inner cancellated. 



Allied evidently to Cryphaa, Climacium, and the splendid 

 exotic genus Spiridens. 



1. FONTINALIS, Dill. 



Dioicous. Sporangium immersed. Veil short, mitriform, 

 toothed, or slightly torn at the base. Outer peristome of 

 sixteen long, narrow teeth, articulated, trabeculate within ; 

 inner of sixteen cilia, united by transverse processes into a 

 conical network, and studded within with projecting points. 



Stem branched bifariously, branches sometimes fasciculate ; 

 leaves nerveless, concave, or keeled, in three ranks. 



1. F. antipyretica, L. ; stems with their leaves triquetrous ; 

 leaves sharply keeled, the margin on one side reflected ; spo- 

 rangium wholly immersed. Hook. Wils. t. xxii. ; Eng. Bot. 

 t. 359 ; (Plate 3, fig. 2 ;) Moug. et Nest. n. 238. 



