CHARACTERS OF TRIBES AND GENERA. 165 



* Fronds pinnate. 



P. Brownii, J. Sm. (v v.) (Adiantum paradoxum, JR. Br.) ; 

 P. falcata (R. Br.) (v v.) ; P. rotundifolia (Forst.) (v v.) ; 

 P. Bridgesii (Hook.) 



** Fronds Hpinnate or more compound. 



P. atropurpurea (Linn.) (v v.) ; P. sagittata (Cav.) ; 

 P. cordata (Cav.) P. calomelaiios (Sw.) (v v.) ; P. dura 

 (Hook.) ; P. flexuosa (Kaulf.) (v v.) ; P. andromedeefolia 

 (Kaulf.) 



OBS. In the " Synopsis Filicum," P. flexuosa is made a 

 synonym of P. cordata, but in cultivation they are seen to 

 be quite distinct, P. flexuosa being scandent like Lygodium, 

 and attaining considerable length. 



75. CINCINALTS, Desv. in part. (1811.) 

 Nothochlcena sp. Hook. Sp. Fil, 



Vernation fasciculate, erect, acaulose. Fronds tripinnate, 

 4 to 12 inches high, slender, pinnee distant, spreading, 

 pinnules ovate, hastate-lobed or trifoliate, plain, smooth, 

 glaucous, or farinose. Veins forked, free. Receptacles 

 terminal. Sporangia, large, globose, sessile, few, in a 

 short series on the upper portion of the venules, becoming 

 laterally confluent, forming a broad sub-entire marginal 

 sorus. Indusium narrow, rudimentary only. 



Type. Pteris nivea, Swartz. 



Illust. Hook, and Bauer, t. 76, A ; Fee Gen. Pil., 5, t. 30 ; 

 J. Sm. Ferns, Brit, and For., fig. 90. 



OBS. This genus consists of about six species of small 

 delicate Ferns, which, under cultivation, are almost annuals, 

 but are freely propagated by spores ; in habit they re- 

 semble Platyloma calomelanos and its allies, but are more 



