280 FERNS : BRITISH AND FOREIGN. 



27. S. filicina, Spring. Monogr. 2, p. 189. S. dichrous, Sort. 



Columbia and Peru. 



28. S. Africana, A. Braun. Revise, No. 23. S. Yogelii, Spring. 



Fernando Po. 



29. S. pubescens, Spring. Monogr. 2, p. 173. Lycopodium 



pubescens, Wall.] S. Willdenovii, Hort. East Indies. 



30. S. Lyallii, Spring. Monogr. 2, p. 168. Lycopodium 



Lyallii, Hook, et Grev. Madagascar. 



31. S. Lobbii, Hort. ; A. Braun. Revise, App. No. 26 ; Veitch. 



Cat. (1861). Borneo. 



32. S. Wallichii, Hort. ; Veitch. Cat. (1861). Penang. 



3. Plants rosulate. 



33. S. cuspidata, Link ; Spring. Monogr. 2, p. 66. S. pal- ' 



lescens, Klot. S. circinalis, Hort. Tropical America. 



34. S. convoluta, Spring. Monogr. 2, p. 69. Lycopodium 



convolutum, Walk, and Arnott. Lycopodium para- 

 doxa, Hort. Tropical America. 



35. S. involvens, Spring. Monogr. 2, p. 63. Lycopodium 



involvens, Sw. India. 



36. S. lepidophylla, Spring. Monogr. 2, p. 27. Lycopodium 



lepidophyllum, Hook, et Grev. Mexico. 



ORDER Y.-MARSILEACEJE. 



Plants growing in, or floating in water (rarely not in water), 

 very various in character, consisting of grass or trefoil-like 

 leaves, or branched with imbricated leaves, bearing sporangia 

 (conceptacles*) at their roots, or base, or on the footstalks, or on 

 small branchlets on the under side, which are 1-4, or many- 

 celled. 



161. MARSILEA, Linn. 



Plants with quadrifid (trefoil-like) leaves on a long footstalk, 

 from a rhizome growing under water. Sporangia (conceptades) 

 borne on the rhizome at the base of the foo'tetalk, or pedicellate 



A hollow case containing spore-cases; a compound sporangium 



