POLYPODIACE^. 71 



long, slightly compressed and sparsely squamose; both kinds about 

 equal in length. Sterile fronds quite smooth and glossy on both sides, 

 with very prominent forked veins, from 3 to 4 inches in length and 12 

 to 15 lines broad, ovate-oblong, having a short acuminate obtuse point 

 and an attenuated base; the fertile smaller, lanceolate., one to XI inches 

 long, and 6 lines broad. 



The sterile state of this very distinct species occurs very frequently 

 in dense humid forests on the Island of Hawaii ; but fertile fronds are 

 rarely to be found. 



Plate 9. — Fig. 3. Plant, of the natural size. 3 a. Scale from the 

 rhizoma, 3 b, Scales from the stipe, 3 c. Sporangium, — Magnified, 



S. Elaphoglossum viscosum, J. Sm. 



Elaphoglossum viscosum, J. Sm. in Hook. Jour. Bot. 4, p. 148. 



Acrostichwm viscosum, Sw. Syn. Ml. p. 10 & 193 ; Willd. Spec. PI. 5, p. 103; Hook. 



& Grev. Ic. Fil. t. 61 (opt.). 

 Olfersia viscosa, Presl, Tent Pterid. p. 234.. 



Hab. Organ Mountains, Brazil : terrestrial. 



There are few of the membranaceous, reticulated, ciliate scales 

 present on our specimens, and these are scattered over the under 

 surface of the sterile fronds. 



D. Elaphoglossum ^emulum. 



E. rJiizomate repente paleaceo-squamoso ; stipitibus glabris semiteretibus 

 supra sulcatis ; frondibus stipitatis coriaceis oblongo-lanceolatis mar~ 

 ginatis basi attenuatis, fertilibus longe stipitatis, 



Acrostichum cemulum, Kaulf. Enum. Fil. p. 68, 

 Olfersia cemula, Presl, Tent. Pterid. p. 235. 



Hab. Sandwich Islands : on trunks of trees, and rocks, as high as 

 8,000 feet above the level of the ocean. 



