136 
FERNS : BRITISH AND FOREIGN. 
63. MENISCIUM, Schreb. 
Vernation fasciculate anil decumbent, or uniserial and sar- 
mentose. Fronds pinnate, rarely simple, 1-8 feet hieh. Pri- 
mary veins costaeform, pinnate ; each opposite pair of venules 
angularly or arcuately anastomosing and sporangiferons, pro- 
ducing from their junction an evcurrent, free, sterile veinlet. 
Beceptacles medial, linear, continued across the junction of the 
venules, forming arcuate, transverse sori. Sporangia in some 
species pilose. 
* Fronds simple. 
1. M. simples, Hook. L 0 nd.J 07 vm.B 0 t. v. 1, t. 11; Hook. Fil. 
Exot. t. 83. — Hong-kong. 
2. M. giganteum, Metten. ; Hook. Sp. Fil. 5, p. 163. — 
Tropical America. 
** Fronds pinnate. 
3. M. triphyllum, Sw. ; Hook, et Grev, Ic. Fil. 1. 120 ; Kunze, 
Fil. t. 52. — India, Ceylon. 
4. M. palustre, Ttadd. Fil. Bras. t. 20 ; Hook. Gen. Fil. t. 40 ; 
Lowe's Ferns, 2, t. 45. — Brazil. 
