188 



F I L I C E S. 



minute tubercles on both surfaces. Costa on both sides pubescent. 

 Son numerous, transversely biserial, the lines close to the costaeform 

 vein of the segment, becoming confluent. Indusium reniform, smooth, 

 and persistent. 



In habit this is similar to the Aspidium patens of Swartz ; which, 

 however, has an entirely free venation, and the lowest pair of seg- 

 ments usually much larger than the others. 



6. Nephrodium Hudsonianum,* Sp. Nov. (Tab. 25.) 



N» stipite Icevi trisulcato ; frond ibus membranaceis pinnatis; pinnis sub- 

 alternis sessilibus linear i-lanceolat is attenuatis pinnatifidis utrinque 

 tuber culatis apice integris basi truncato-cuneatis, infimis distantibus 

 cordato-ovatis, laciniis oblongis obtusis subfalcatis; rJmchi costaque 

 supra pubescentibus ; soris parvis; indusiocordato-reniformi hirsuto. 



Hab. Sandwich Islands : among bushes, on the margins of forests. 



Stipe smooth, semiterete, trisulcate in front. Fronds large, membra- 

 naceous, 3 or 4 feet in length, in circumscription lanceolate and atte- 

 nuate at the base, pinnate, with a pinnatifid point. Pinnae from 6 to 

 8 inches long, and 8 to 10 lines broad, subaltemate, sessile, linear- 

 lanceolate and attenuate, pinnatifid at the base about half way down to 

 the costa, incisely serrate towards the point, which is entire for about 

 an inch; the inferior ones distant, short and cordate-ovate, all beset 

 with small tubercles on both sides. Segments oblong, with an obtuse, 

 minutely dentate apex, falcate, or sometimes straight, the margin 

 occasionally pubescent with a few and short scattered hairs. Ehachis 

 and costa pubescent above, with sparse whitish hairs. Sori small, bise- 

 rial, about equidistant between the costseform vein and the margin 

 of the segments, having a cordate-reniform indusium, hirsute with a 

 few hairs in its centre. 



Although very distinct, yet in some points this bears a strong 

 resemblance to the N. cyatheoides of J. Smith; but the fronds are 

 more membranaceous, and the pinnae pinnatifid, the inferior pair of 



* In compliment to Captain "William L. Hudson, of the United States Navy, com- 

 mander of the Peacock, one of the vessels of the Expedition. 



