CHARACTERS OF TRIBES AND GENERA. 131 



Sp. M. bifurcatum (Sio.) (v v.) ; M. dimorphum (Hook, 

 and Grev., t. 145). 



This species is also a native of St. Helena, and is con- 

 sidered by some to be only a form of the preceding-. 



46. PSOMIOCARPA, Presl (1849). 



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



Vernation fasciculate, erect, acaulose. Fronds sub-bipin- 

 natitid deltoid, Ahe sterile 6 to 18 inches high, pilose, with 

 articulate hairs, segments oblong lanceolate. Veins forked, 

 venules free. Fertile fronds 8 to 12 inches high, long 

 stipate, slender, wholly contracted, forming a sporangi- 

 ferous panicle. 



Type. Polybotrya apiifolia, J. Sm. 



Illust. Moore Ind. Fil., p. 1, fig. 8 ; J. Sm. Ferns, Brit. 

 and For., fig. 36. 



OBS. This genus is founded upon a very peculiar Fern, 

 a native of the Philippine Islands, and was originally 

 placed by me under Polybotrya. Setting aside the con- 

 traction of the fertile fronds, it might be taken for a small 

 multifid species of PJiegopteris or Laslrea. 



Sp. P. apiifolia (/. Sm..) (v v.) (Polybotrya apiifolia, 

 J. Sm., 1841. Kunze in Schk. Fil., t. 62. Gard. in Field, 

 Sort. t. 30, 31), 



47. EGENOLFIA, Scliott. (1843). 



Polybotrya sp., auct. ; Acrostichum sp., Hnok. Sp. Fil. 



Vernation sarmentose, short, sub-hypogeous. Fronds 

 contiguous, stipate, pinnate, rarely bipinnatifid, 1 to 3 feet 

 high, generally viviparous ; sterile pinnse linear lanceolate, 

 sub-entire or dentate, laciniated or pinnatifid, sinus mu- 

 cronate. Veins forked or pinnate, venules free. Fertile 



