CHARACTERS OF TRIBES AND GENERA. 141 



(Acrost., t. 27) ; L. heteromorpha, /. Sm. (LomariajUiformis, 

 A. Cunn., Hook. Sp. Fit. 3, 1. 149; L. pimpinellce folia Hook.fil. 

 in Hook. Lond. Journ. of Bot. 3, p. 412). 



OBS. This last is a native of New Zealand, and very 

 variable in the form of its fronds ; in what may be termed 

 the perfect state, the pinnae are lanceolate, and 2 to 3 inches 

 in length, whereas in the variety termed pimpinellcefolia 

 they are numerous, small, and nearly round, not exceeding 

 a quarter of an inch in diameter. 



With regard to L. leptocarpa, it is peculiar in having a 

 thickened base to the stipes, analogous in appearance to 

 the articulate node that characterises the division Eremo- 

 brya. Fee describes it as "frondibus articulatis." My 

 own observation, however, is that it is not jointed with 

 the sarmentum. 



56. ARTHROBOTRYA. /. Sm. 

 Polybotrya, J. Sm. t 1841 ; Acrostichum sp., Hook. Sp. Fil. 



Vernation uniserial, sarmentose. Fronds distant, bipinnate, 

 3 to 4 feet high, pinnae alternate, 6 to 8 inches long, patent, 

 articulate with the rachis ; sterile pinnules contiguous, 

 twenty to thirty pairs, obliquely oblong, inch in length, 

 short petiolate and articulate with the rachis, which is sub- 

 alate. Veins forked, free. Fertile pinnules linear falcate, 

 smaller than the sterile, the under disk wholly sporangi- 

 ferous. 



Type. Polybotrya articulata, J. Sm. 



Illust. Fee's Acrost., p. 74, t. 37. 



OBS. The Fern bearing the above character being so 

 different in general habit from true Polybotrya, I am induced 

 to separate it as a distinct genus. The articulate pinnae 

 and pinnules distinguishes it from Polybotrya, and the 

 bipinnate fronds from Lomariopsis. 



