OKDER 159. FILICES. 419 



Ing on the inner side from the base to the summit Indusiuni a scale-like 

 veil covering each sporange. (Fig. 310.) 



L. pal mat um Swtz. Smooth throughout; stem flexnous, thread-like or wire-like, 

 climbing 3 5f ; fronds palmately 5-7-lobed, 2 on each short stipe, lobes entire, obtuse ; 

 upper frond? contracted, fertile, each a cluster of spikelets. Abundant in a swamp in 

 Windsor, Conn. (Dr. Wm. Wood) ; also rarely found in N. J., Ky., and S. 



5. SCHIZ^EA, Sm. Sporangia oval, crowned with a ring at top, sessile, 

 opening laterally. Indusiuni continuous, formed of the inflexed margins of 

 the Ifts., which are contracted, spike-like, crowded at the top of the frond. 

 S. pusilla Ph. Fronds clustered, simple, linear-filiform, tortuous, 36', the fertile 



bearing a few little spikelets at top in two rows. Barrens, Quaker Bridge, N. J. Aug. 



6. ANEIMIA, Swtz. Sporangia sessile, crowned with a ring, in 1-sided 

 panicled spikes, in partially or wholly fertile fronds. Indusium none. 

 Fronds erect. 



1 A. adiantifolia Sw. Fronds 612', on a slender stipe, 3-parted, the middle division 



sterile, 2- or 3-pinnate, the lateral ones fertile panicles on long stalks. S. Fla. t 



2 A. MANDIOCCANA. Fronds 1215', long-stiped, 3-parted like the other, but the sterile 



division simply pinnate with lance-oblong serrulate pinnae. S. America. 



7. TRIOHOMANES, L. Sporangia with a transverse complete ring, 

 and arranged on the base of a thread-like receptacle, which is in and ex- 

 sertcd from a cup at the edge of the pellucid frond. 



1 T. r a die a iis Sw. Fronde thin and delicate, 6', lance-ovate, bipinnatifid, pinnae 



triangular, obtuse, very oblique at base ; receptacle exserted. South. Rare. 



2 T. ELEGANS. Sterile frond pinnate, fertile, long-linear, edged and fringed all around 



with the thread-like receptacles and their cups. From S. America. 



8. CYATHEA, Sm. Sori globular, on the veins, wholly enclosed in an in- 

 dusinm, which soon opens and remains cupform. Sporangia subsessile on 

 an elevated receptacle. 5 With cylindrical trunks. 



C. ARBOREA. Trunk 10 20f, unarmed, simple, crowned with a spreading tuft of bipiu- 

 nate fronds 6 Sf long, gracefully arched ; pinnulse again pinnatifid or lobed, cups in 

 2 rows, smooth, round, entire. Grows near Panama 1 t 



9. ALSOPHILA ASPERA. Another Tree Fern, from W. Indies, cult, by 

 Mr. Buchanan, at Astoria, N. Y., under the name of Hematelia horrida. Trunk 6 IGf, 

 bearing a splendid crown of fronds 4 5f long, arched and spreading, tripinnate. Piul. 

 deeply lobed, lobes obtuse, each with a double row of fruit-dots, which at first are covered 

 with jagged scales, but finally naked. Stipe and rachis prickly. A. PRUINATA, very ele- 

 gant, with a trunk near If, clothed with light-brown woolly hairs, and a crown of light- 

 green bipinnate fronds, 3f long, is growing with the other. 



10. ACROSTICHUM, L. Fronds simple or pinnate. Sporangia 

 Blattered (not in sori), occupying the under surface of the whole or a part 

 o! the frond. Veins netted. 



A, aiireum L. A noble Fern, 3 6f high, coriaceous, evergreen, pinnate, with alter- 

 nate, lance-oblong, entire pinnse. Swamps, Fla., and in conservatories. 



11. PLATYCERIUM, Desv. STAG-HORN FERN. Fronds coriaceous, 

 net-veined, forking at the summit. Sporangia in large patches on the uudef 

 surface of the frond. From Africa, &c. 



