XC. GEITEBA OF FEENS : 



Fronds pinnate, narrow elongate, herbaceous or sub-coriaceous, 

 tbe pinnae articulated. Kliizome short erect, producing elongated 

 slender stolones whicb bear fasciculate crowns at intervals ; 

 or elongately creeping; sometimes tuber-bearing. The fronds 

 are annual in one tuberous species. — The attachment of the in- 

 dusium is obviously different in the two groups forming this 

 genus, in the one approaching the aspidioid, in the other the 

 davaUioid structure ; so that were it not for their uniformity of 

 character in all other respects, they might form separate genera. 



§ Cardioeiegia. — Indusium roundish cordato-renifonn, affixed sub-cen- 

 trally by its sinus. 



Ex. : N. platyotis, Sze. 

 N. hirsutula, Presl. 

 N. splendens, Presl. 

 N. trichomanoides. J. Sm. 



N. biserrata, SchoU. 

 N. punctulflta, Presl. 

 N. biaurita, Presl. 



N. repens, Brachenridge. 



§ Nephrolepw. — Indusium reniform, affixed by its oblique arcuate base, 



Ex. : N. exaltata, Sckott. I N. tuberosa, Presl. 



N. pectinato, Schott. N. tindulata, J. Sm. 



N, davallioides, Zze. | N. obtasifolia, Presl. 



§ 20 CTSTOPTEEIDEa;. 



125. CYSTOPTEE.IS, Sernhardi, Schrad. Neues Jowrn. 

 Sot. i. part ii. 5, 26, t. 2, f. 9. 



Cystka, Smith; Ctclopteeis, 6ra/y; Asproii sp., Auct.; Poltpodii 

 sp., Auct ; Ctateeje sp., Auct. ; Nbphbodii sp., Atict. ; AlETBlI sp., 

 Auct. 



Son indusiate, rotundate ; the receptacles medial. Indusium 

 roundish-ovate, fornicate or sub-hemispherical, affixed by its 

 broad base, the apex often lacerate, sometimes acuminate. Teins 

 simple, forked or pinnate from a central costa ; venules free. 



Fronds membranaceo-herbaceous, bi-tri-pinnate. Bhizome 



tufted, decumbent, or elongated and creeping. — ^A genus of small 



and elegant ferns, of which the species are sometimes not easily 



distinguished by the fronds only, even though, as in the case of 



the widely creeping C tenuis, and the close tufted C fragilis, 



there may be present, when growing, differences that, as we 



think, prevent their being united. 



Ex. : C. fra^;ilis, Bernh. | C. Dou§;la8ii, Hook. 



C. regia, jDesv. | C. tenuis, Desv. 



C. bulbifera, Bernh, \ C. montana, Bernh. 



