OF ARTS AND SCIENCES. 275 



nali oblonga ; operculo et caljptra precedentis. — On rocks in ravines. 



— Fronds slender, 4-5 lines high, dark olive-green. Near F. Rave- 

 nelii, but a taller plant with more oblong leaves, their dorsal lamina 

 broad and obtuse at the base. 



17. F. RUFULUS {sp. nov.) : synoicus perparvulus simplex ; foliis 

 5-7-jugis lanceolato-linearibus sensim acutis rufulis integerrimis im- 

 marginatis, e cellulis majusculis hexagono-rotundatis pellucidis areo- 

 latis, dujDlicatura ^ producta apice inaequali, lamina dorsali latiuscula ad 

 basin abrupte desinente, costa concolori percurrente ; capsula breviter 

 pedicellata ovali-oblonga ; caljptra conica longum operculi rostrum 

 solum tegente. — On reddish earth, attached to the roots of trees uptorn 

 by wind. — A minute species, 1-2 lines high, of a pale brownish-red 

 color : agrees in many respects with the description of a Surinam spe- 

 cies, F. pellucidus, Hornsch. in Linncea, 1841, p. 146, but the leaves are 

 of a firm texture, and the areolation, though large, not splachnoid ; fur- 

 thermore, the inflorescence is synoicous, which is not asserted of the 

 Surinam plant. 



18. F. ANGUSTiFOLius {sp. nov.) : dioicus pusillus conferte flabella- 

 tim foliosus ; foliis linearibus angustissimis longissimis acutis circum- 

 circa marginatis integerrimis densius pellucido-hexagono-areolatis, 

 duplicatura ^ pi'oducta, lamina dorsali ad basin desinente, costa cum 

 apice dissoluta ; capsula terminali ovali-oblonga seu oblongo-obovata ; 

 operculo capsulam excedente ; calyptra dimidiata operculum vix tegente. 



— Wet places on the ground in dense wooods. — Fronds 1-2 lines 

 high and nearly as wide. Leaves bright green, crisped when dry, short 

 below, rapidly increasing in length as they ascend. Pedicels 4-5 lines 

 high. 



19. F. SPHAGNiFOLius {sp. nov.) : dioicus pusillus ; fronde decli- 

 nata ; foliis flaccidis 5-9-jugis confertis flabellatim expansis longe line- 

 ari-lanceolatis integerrimis hie illic submarginatis, cellulis amplissimis 

 subrhombeis flexuose circumscriptis utriculo primordiali valde evoluto, 

 duplicatura ingequali vix ^ producta, costa longe infra apicem dissoluta ; 

 capsula terminali in pedicello geniculato-ascendente intequali-oblonga 

 incurva ; operculo longe rostrato calyptram lineari-conicam excedente. 



— Found growing with No. 17. — Fronds similar in size and outline to 

 those of No 18 ; pedicels longer. 



20. F. CLAViPES {sp. nov.) : dioicus perpusillus simplex vel parce 

 ramosus laxifolius ; foliis 8 - 10-jugis lineari-lanceolatis ubique densius 

 pellucide rotundato-areolatis basi duplicaturas ^ productse laxius oblongo- 



