﻿540 66. SYNGRA^raA. 



§ 4. HEMIGRAMMA. Veins anastomosing more or less copiously. Sori free 

 or reticulate. Fronds simple or irrejzularly incised, dimorphous, the barren 

 ones often forming a i-ather dense rosette. Main veins present. 



§ 3. DICTYOGRAMME. Veins and sori as in § 4. Fronds simple or divided, 

 uniform, the barren ones not in a dense rosette. No main veins. 



a. 



a^a. 



% 2. TOXOPTERIS. 



Fronds simple, entire, crenafe or slighfly toothed. 



b. Fronds ohlmuj, mil more than 4 X fi-^ ^ong as broad. 



(1) S. valleculata. 

 b.b. Fro'ids lanceolate, ligulate or linear, more than 4 X ^^f^O ^* broad. 

 c. Fronds rounded at the apex. (2) S. obtusifolia. 



C.C. Fronds not decidedly rounded at the apex. 



d. Fronds narrow-linear, under 5 m,.M. broad, the apex suddenly 

 acute. (5) S. Dayi. 



d.d. Fronds broader, at least the bnrren ones more than 5 m.M. 

 broad, the apex + acuminate. 



e. Fronds entire; barren fronds not much broader than the 

 fertile ones. (4) S. Lobbiana. 



e.e. Fronds crenate or slightly toothed; barren fronds distinctly 

 broader than the fertile ones. (5) S. borneensis. 



Fronds simple, conspicuously toothed with + spreading, sharp or blunt- 

 oblong, cartilagineous teeth or spines. (6) S. cartilagidens. 



(1) S. vallecula^ta^, C. Chr., Ind. Fil.; Gymnogramme valleculata, 

 Bk., Journ. of Bot., XXVI, 325. 



Rhizome w^oody, short-creeping, clothed with short, stiff, subulate, brown 

 scales. Stipes glossy, naked, castaneous, 13 — 23 c.M. long. Fronds oblong, 

 entire, 10—13 c.M. long, o'/a — ■' c.M. broad at the middle, deltoid or rather 

 rounded at the base, the apex deltoid or obtuse, the margin revolute. Texture 

 rigid, thick; costa castaneous; surfaces naked; veins immersed, obscure, anasto- 

 mosing near the margin. Sori immersed, erecto-patent, reaching nearly to the 

 edge. 

 Borneo. 



