CHARACTERS OF TRIBES AND GENERA. 165 



* Fronds pinnate. 

 P. Brownii, /. Sm. (v v.) {Adiantum paradoxum, R. Br.) ; 

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

 P. Bridgesii (Hook.) 



** Fronds hipinuate or more compound. 



P. atropurpurea (Linn.) (v v.) ; P. sagittata (C'av.) ; 

 P. cordata (Car.) ; P. calomelanos (Su>.) (v v.) ; P. dura 

 (Hook.) ; P. floxuosa (Kaulf.) (v v.) ; P. andromeda;folia 

 (Kaulf.) 



Obs. — In the " Synopsis Filicum," P. /ferjiosa is made a 

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

 be quite distinct, F.fiexiiosa being soandent like Lijrjodimn, 

 and attaining considerable length. 



75. — CiNCiNALTS, Beso. in part. (1811.) 

 Notliocldmna spi. Hook. Sp. Fil. 



Vernation fasciculate, erect, acaulose. Fronds tripinnate, 

 4 to 12 inches hig-h, slender, pinnas distant, spreading, 

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

 glaucous, or fax'inose. Veins forked, free. lieceptacles 

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

 short series on the upper portion of the venules, becomuig 

 laterally confluent, forming- a broad sub-entire marginal 

 sorus. Indusium narrow, rudimentary only. 



Type. Pteris nivea, Sieartz. 



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

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



Obs. — This genus consists of about sis 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 



