CHARACTERS OF TRIBES AND GENERA. 177 



length, forming a continuous linear immersed sorus on 

 each side of the mid-rib, and which become confluent. 



Type. Diclidopteris angustissima, Brackenridge. 



lllust. Brack., United States Expl. Exped. XVI. 135, 

 t. 17 ; Moore, Ind. Fil., p. 13, B. 



OBS. The grass-like fronds of this Fern not exceeding 

 a line in width, renders it difficult to determine the exact 

 nature of its venation. Careful examination induces me 

 to draw up the above character, which agrees with that 

 given by Brackenridge ; but in the " Species Filicum " the 

 line of sporangia are described as only occupying one side 

 of the costa. 



Sp. D. angustissima, Brack. (Monogramma Junghulmii, 

 Hook. Sp. Fil. 5, t. 289, B ; Bedd. F. 8. Ind., pi 210). 



Native of Ceylon, Java, Philippines and Polynesian 

 Islands. 



85. PLEUROGRAMMA, Presl. (1836). 

 Monogramma sp. Hook. Sp. Fil. ; Taenitis sp. Kaulf. 

 Vernation fasciculate, erect, acaulose. Fronds caespitose, 

 1 to G inches high, simple linear or forked, opaque, the 

 upper portion concave or folded. Veins in the lower part 

 simple, direct, oblique, the upper or fertile part absent. 

 Sporangia produced in a line on each side of the costa, 

 becoming confluent, forming a central sorus. 

 Type. Pleurogramma linearis, Presl. 



lllust. Hook, and Bauer, Gen. Fil, t. 75, A; Schott., 

 Gen. Fil., t. 17, under Cochlidium ; Moore, Ind. Fil., 

 p. 14, A; Hook., Syn. Fil., t. 6, fig. 51, c. d. 

 OBS. This as a genus differs from Monogramma by the 

 presence of lateral veins, and in the sporangia being pro- 

 duced in a line on each side of, and close to, the mid-rib, 

 also in having fasciculate vernation. 

 N 



