naoeous, cup-shaped, at first globose and covering the soruB, 

 opening in a oircumacissEe manner near the apex, the cup remain- 

 ing entire ; or the cup bursting unequally j or, sometimes, open- 

 ing vertically in 4 — 6 nearly equal spreading divisions. Veins 

 (in the ultimate divisions) simple forled parallel-forked or pin- 

 nate, from a central costa ; venules free. 



Fronds large, herbaceous, simple pinnate bi-pinnate or de- 

 compound. Trunk or caudex arborescent. — Distinguished among 

 the oyatheaceous ferns by the cup-shaped involucre completely 

 surrounding the sorus. 



§ SphxropterisSoA axillary, at the forks of the veins. 

 C. diverffens, Xee. 



rergeni , 

 C. Pervulicana, Me. 

 C. excelfla, Sw. 

 C. spinulosa, Wall. 

 C. vestita, MoHius. 

 C. elegans, Meward. 



Ex. : C. mcdullaris, 8w. 



C. canaliculata, WiUd, 

 C. Drcgei, Kze. 

 C. cuspidata, S!ze. 

 C. Sehansclmi, 3fa/riiti8. 

 C. Smithil, Rh.fil. 



§ iVo^oearpiff.— Sori medial on the veins or venules. 



Ex. : C. sinuata, Hook, and Gr. I C. mexicana, Schlech. 

 C. Brunouis, Wall. \ ? C. Iffivigata, Willd. 



(b) Involucres half (nip-shaped. 

 * Vems uniting i/n costal arcs (in some species rarely wmted.) 



146. HEMITELIA, 5. Sroum, Prod. Ft. Nov. Soil. 158, 

 (reduct.) 



CiTEMiDAiiiA, PresZj ELBUTHBEiAj^wMte; Hemistegia, Pj-es? ; Micros- 



TEGWTJS, PrefiZ; AciIlfOPHLSEIA, Pre82; Ctaihe^ sp., Auct.j Poly- 

 PODII sp., Auct. 



Sori involucrate, globose ; the receptacles globose, medial or 

 axillary. Involucre dimidiate i.e. semioalyciform with the an- 

 terior side deficient, becoming at length refiexed. Vems forked 

 parallel-forked or pinnate, &om a central costa ; the basal veins 

 or venules (next the rachis) arcuately anastomosing, forming 

 elongated costal arcs from the exterior side of which free veinlets 

 are produced ; vermles otherwise free. (In M, speciosa and some 

 allied forms, whether species or varieties, the costal arc is only 

 here and there produced, the veins being usually free.) 



Fronds large herbaceo-coriaocous, pinnate bi-pinnate or de- 

 compound. Trunk or caudex arborescent. — This genus, which is 



