P0LYP0DIACEJ1. 235 



dark brown and cartilaginous, its margin slightly lacerated; the spo- 

 rangia in an advanced state covering the not very evident costa. 



This is very distinct from either of the two preceding species, in 

 the smaller size of the fronds, the shorter and broader pinnules, and 

 the asperous and densely paleaceous reddish stipe and rhachis. May 

 it not be the B. squarrosum ? figured in the Voyage of the Bonite, 

 which we have never had an opportunity to examine. The whole 

 plant partakes a good deal of the habit of many species of Pohjstichum 

 of Both. 



46. DICLIDOPTJERIS, Nov. Gen. 



Yence simplicissimce, rectce, liberce, intramarginales, nempe unica inter 

 costam suhtus prominentem et margines frondis angusto-linearis cequi- 

 distans, receptacidum sporangiferum continuum efficiens, indusium an- 

 gusto-linear e homogenewm (texturce frondis) planum, margine libero 

 costam respiciente, gerens. /Sporangia pedicellaia. Spondee triangu- 

 lares. 



t. DlCLIDOPTERIS ANGUSTISSIMA. (Tab. 17.) 



H&b. Samoan and .Feejee Islands: on trunks of trees in '•humid 

 forests. 



Rootstock short, creeping. Fronds numerous, tufted, membra- 

 naceous, entire, linear, acute, from 3 to 6 inches long and about a 

 line broad : costa on the under side prominent^ veins scarcely evident, 

 a single one starting off from the costa each side, near the base of the 

 frond, and continuing for nearly its whole length, equidistant between 

 the costa and margin. Occasionally this vein is wanting on one side ; 

 consequently such a frond has only one linear simple sorus. Sporangia 

 becoming confluent and concealing the costa. 



This has the habit of Monogramma of Schkuhr, a genus which has 

 no lateral veins nor indusium. But its nearest affinity is to Blechnum, 



