14 
COPELAND. 
1. SALVINIA (Micheli) Adanson. 
Leaves borne in whorls of 3, of which two are normal undivided leaves, 
borne on the dorsal side, and the other, ventral, one, called the “water- 
leaf” is dissected, metamorphosed to replace the roots, which are wanting ; 
normal frond with costa and veinlets; sori borne on the basal segments 
of the water-leaves. Thirteen species, chiefly tropical. 
Leaves horizontal, flat, oblong 1. 8. natans 
Leaves suberect, wider than long 2. 8. cucullata 
1. Salvinia natans (L.) All. (Plate X, A.) 
Fronds stalked, horizontal, oblong, about 1 cm long, half as broad, 
rounded at both ends or the base cordate, veinlets 17 to 20 on a side, 
each with 6 to 8 tufts of fine bristles on the upper surface; nether sur- 
face and stem brownish-pubescent. 
Plains of India, China south to Fokien, Japan; northern Asia and Europe. 
2. Salvinia cucullata Roxb. 
Fronds sessile, congested, nearly or quite erect, with inflexed margins, 
12 to 15 mm broad, not so long; venation lax, veins 10 to 12 on a side; 
upper surface bearing minute papilla}, nether surface nearly naked. 
India; western Australia. 
2. AZOLLA Lamarck. 
Fronds very small, borne in two dorsal rows, deeply bilobed, each lobe 
with a midrib but no veinlets; fine roots borne on the under side of the 
stem. Five species. 
Azolla africana Desv. (Plate X, B.) 
Plant 1 cm more or less long and wide, branching freely and rather 
irregularly; leaf-lobes obovate, rather more than 1 mm long; roots, at 
least usually, not clustered; not feathery; macrospores with 9 floats. 
(A. pinnata R. Br. of Australia is a larger plant, regularly branched, 
with very feathery roots.) 
Tropical Africa to the Philippines and Nippon. 
eufilicine.se. 
5. OSMUNDACEiE. 
Rhizome mostly erect, stout ; fronds pinnate to tripinnatifid, veins free ; 
sporangia on specialized fronds or parts of fronds, or the backs of 
normal fronds, annulus reduced to a cluster of thick-walled cells, slit 
extending from this cluster across the apex to the other side of the 
sporangium; indusia wanting. 
A small family related to the Gleicheniaceae and Schisaeaceae, and probably 
to the eusporangiate ferns. Three genera: Leptopteris (7 species) in Austral- 
asia; Todea (1 species) from New Zealand to S. Africa; and Osmunda. 
