FILICES. 687 



Or.). Aspidium umbrosum, Sw., Schk. {non IF.).— Lowest primary segments 1' long, 3"- 

 4 ' broad ; sori V"~^"> loug.~HAB. Jamaica !, Pd. ; [Venezuela !, Ecuador ! ! Pacific islauds 

 to New Zealand, Australia and East Indies !]. 



225. A. Franconis, Metten. Leaf 3-2-pinnatisect, "oblong:" ultimate segments 

 pinnatifid-serrate, upward produced at the base : veinlets pinnate, simple or forked, most 

 fertile ; sori linear, extending from near the vein to or beyond the middle of the segment, 

 lowest anterior mostly double ; indusium flatfish.— Metten. Asplen. t. 5. /. 30 : a leaf- 

 segment. — Diplazium, Liehm. ■. leaf " 2-pinnatisect," while it is usually 3-piiinatiseet in the 

 Jamaica Fern.— Habit of A. fascopubescens, Hook. (Spruce, 5416), which I refer to 

 A. ahenum, Metten. Primary segments " 4"-7" long, 2" broad ;" sori 2"'-l w long.— Hab. 

 Jamaica!, March; [Mexico to Peru]. 



sect. 3. Athyrium, Rth. — Sori shortly oblong or half-oval, inferior for several) produced 

 beyond the vein at their extremity and there supported by the auricle of the arcuate in- 

 dusium. 



This section is known to pass into Aspidium .• I adopt the arbitrary limits proposed by 

 Mettenius, retaining in Aspfenium those species where the indusium is lateral, aud, though 

 often shortly, decurrent along its vein. 



226. A. conchatum, Moore. Leaf pinnatisect, ovate-oblong : segments oblong- 

 linear, pinnatipartite, superior deeply piunatifid : lobes or special segments oblong, blunt, 

 serrate or serrulate : veinlets pinnate, simple, lowest veins on the inferior side of their rib ; 

 most sori shortly oblong or half-oval: indusium convex. — Tee, Polypod. t. 17. C. f. 1. 3. 



Hypocblamvs peetinata, Pee. — Primary segments 6"-l2" long, H" broad; sori £'" long. 

 ~Hab. Jamaica!, Pd., At., mis. ; [Cuba!, Wr. 1045; Haiti!]. 



Series 3. Aspidieee. — Son confined to special points on the back of the leaf. 



Subscries 1. Euaspidieae. — Receptacle flat. Sporangia with a vertical, usually in- 

 complete ring. 



38. MENISCIUM, Schreb. 



Sori shortly arcuate, inserted into the anastomosis of special veinlets, meeting between 

 costate veins, naked. — Leaf usually pinnatisect .• intercostal vein-arches with a free append- 

 aye ; sori special between the veins, often confluent, 



227. M. reticulatum, Sw. Leaf pinnatisect : segments oblong-lanceolate or lanceo- 

 late, acuminate, crenufate-repand or repand, obliquely rounded or cuueate at the subsessile, 

 or shortly petiolulated base : arches between the veins 12-15. — Plum. Pit. t. 110. Schk. 

 Crypt, t. 5.- Polypodium, X.— Segments 4"-8"(-10" long). 



«. Segments oblong-lanceolate, most subsessile, l"-li" broad : rhaehis puberulous. 



£. sorbifolium, W., Kze. Segments lanceolate, inferior shortly petiolulate, 10"'-12 w 

 broad : rhaehis glabrescent. — M. Kapplerianum, Fee !' 



Hab. Dominica !, Imr., S. Vincent !, Guild. ; Trinidad !, Lockh. ; [French islands ! ; 

 Mexico ! to Brazil ! ; Fernando Po !]. 



228. M. angtxstifolium, W. Leaf pinnatisect .- segments numerous, lanceolate-linear, 

 acuminate, entire, obliquely cuneate or rounded at the petiolulated or subsessile base : arches 

 between the veins 6-8.— M. sorbifolium, Eat. {PI. Wr. 781).— Segments 5"-6" long, 

 6" -8'" broad.— Hab. Jamaica!, Wits., Pd., on stones, in river-courses ; [Cuba !, Panama ! 

 to Venezuela 1]. 



229. M. s erratum, Cav. Leaf pinnatisect : segments lanceolate, acuminate, sharply 

 serrate, obliquely rounded at the subsessile base : arches between the veins 6-8.— Segments 

 5"-7"long, 10""'-12'" broad.— Hab. Trinidad !, Lockh., Sch.; [Mexico to Brazil !]. 



39. DIDYMOCHLjENA, Desv. 



Sori oval, inserted into the thickened extremity of a veinlet : indusium above the sorns. 

 proceeding from the oblong middle part of the receptacle, free at the sides.— An arboreou* 



