494 
FILICES. 
[. Nephrolepis 
Aspidium biserratum, Sw. ; Bojer , Hort. Maur. 390. A. mauritianum, 
Desv. ; Bojer , Hort. Maur. 389. Nephrodium splendens, Bojer , Hort. 
Maur. 392. 
Mauritius, Rodriguez, and Seychelles, common in woods, both, in the plains 
and amongst the hills. Cosmopolitan in the warmer zones. 
21. NEPHRODIUM, Rich. 
Capsules stalked, splitting transversely, with an incomplete vertical 
ring. Sori round, placed on the back of the segments generally on the 
middle of a vein covered with a reniform superior involucre. — Fronds of 
very various texture and. cutting, the veins free or variously anasto- 
mosing. Distrib. Cosmopolitan. Species 250. 
Subgenus Lastrea. Veins all free. 
Frond oblong-lanceolate, bipinnatifid. 
Rootstock wide-creeping 
Rootstock erect. 
. . . 1. 
Lower pinnae not dwarfed .... 
Lower pinnae much dwarfed. 
... 2. 
N. CRINITUM. 
Frond obscurely pilose 
... 3. 
N. PROLIXUM. 
Frond densely pilose . . . . . 
... 4. 
Frond deltoid, tripinnatifid or still more compound. 
Rachises not scaly. 
Frond glabrous. 
Sori medial 
Frond tripinnatifid. 
Tertiary segments symmetrical at the base 5. N. Filix-mas. 
Var. ELONGATUM. 
Tertiary segments unsymmetrical at the base 6. N. sparsum. 
Frond quadripinnatifid 7. N. Wardii. 
Sori nearly marginal 8. N. Hornei. 
Frond pubescent. 
Frond ^-1 foot long 9. N. crenatum. 
Frond several feet long 10. N. lanuginosum. 
Rachises densely scaly 11. N. oppositum. 
Subgenus Etjnephroditjm. Veins in regular pinnate groups, one or 
a few of the lower ones in each group uniting by their tips. 
Rootstock wide-creeping. 
Lowest pinnae not dwarfed 12. N. unitum. 
Lowest pinnae much and suddenly dwarfed. 
Pinnae -|-£ in. broad 13. N. cucullatum. 
Pinnae ^-1^ in. broad 14. N. elatum. 
Rootstock suberect or short-creeping. 
Pinnae shallowly lobed 15. N. Arbuscula. 
Pinnae deeply lobed. 
Frond more or less pilose 16. N. molle. 
Frond glabrous 17. N. truncatum. 
