CHAEACTEES OF TEIBES AND GENERA. i// 



length, forming a continuous linear immersed sorus on 

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



Type. Diclidopterls angustissima, Brachenridge. 



lUust. 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 Filicnm " the 

 line of sporangia are described as only occupying one side 

 of the costa. 



Sp. D. angustissima. Brack. (JiLonogrwmma Jimgliiihnii, 

 Eooh. Sp. Fil. 5, i. 289, B ; Bedd. F. S. Ltd., pi. 210). 



Native of Ceylon, Java, Philippines and Polynesian 

 Islands. 



85. Pletjeograjdia, Presl. (1886). 

 Monograinma sp. Hooh. Spi. Fil. ; Tcenitis sp. Kaulf. 

 Vernation fasciculate, erect, acaulose. Fronds casspitose, 

 1 to 6 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. 



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

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

 p. 14, A; Hook., Syn. Fil., t. 6, fig. 61, c. d. 

 Obs. — This as a genus differs from Monograinma 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 



