1C. GENEBA OP TEENS : 



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

 the pinnae articulated. Ehizome short erect, producing elongated 

 slender stolones which 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 

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

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



Cafdiostegia. Indusium roundish cordato-reniform, affixed sub-cen- 

 trally by its sinus. 



, : N. platyo 

 N. hirsut 



tis, Kze. 

 tula, Presl. 

 N. splendens, Presl. 

 N. trichomanoides. J. Sm. 



N. biserrata, Schott. 

 N. punctulata, Presl. 

 N. biaurita, Presl. 

 N. repens, Brackenridge. 



Nephrolepit. Indusium reniform, affixed by its oblique arcuate base, 

 Ex. : N.. exaltata, Schott. \ N. tuberosa, Presl. 



N. pectinata, Schott. N. undulata, J. Sm. 



N. davallioides, Kze. \ N. obtusifolia, Presl. 



20 



125. CYSTOPTERIS, Eernhardi, Schrad. Neues Journ. 

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



CYSTHA, Smith; CYCLOPTBEIS, Gray; ASPIDII sp., Auct,; POLYPODII 



8p., Auct ; CYATHBJ! Sp., Auct. ; NEPHEODII Sp., Auct. ; AlHYEII 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. Veins 

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



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

 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. tennis, and the close tufted C. fragilis, 

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

 think, prevent their being united. 



Ex. : C. fragilis, Semh. I c. Douglasii, Hook. 



*ja ,Den. C. tenuis, Dem. 



C. bulbifera, Sernh. C. montana, Sernh. 



