136 



FERNS I BRITISH AND FOREIGN. 



63. MENISCIUM, Schreb. 



Vernation fasciculate and decumbent, or uniserial and sar- 

 mentose. Fronds pinnate, rarely simple, 18 feet high. Pri- 

 mary veins costaeform, pinnate ; each opposite pair of venules 





Genus 63. Portion of mature frond. No. 4. 



angularly or arcuately anastomosing and sporangiferous, pro- 

 ducing from their junction an excurrent, free, sterile veinlet. 

 Receptacles medial, linear, continued across the junction of the 

 venules, forming arcuate, transverse sori. Sporangia in some 

 species pilose. 



* Fronds simple. 



1. M. simplex, Hook. Lond.Journ. Bot. 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 Gr&o. Ic. Fil. 1. 120 ; Kunze, 



Fil. t. 52. India, Ceylon. 



4. M. palustre, Radd. Fil. Bras. t. 20 : Hook. Gen. Fil. t, 40 ; 



Lowe's Ferns, 2, t. 45. Brazil. 



