34 
17. L. reeurva, Newm. 
Has. Britain. 
Oss. By some botanists this is considered only as a variety of 
L. dilatata.* n cultivation it appears to maintam a more dwarf 
and rigid habit than the usual form of L. di/atata. 
18. L. eburnea, J. Sm. Aspidium eburneum, Wa/7. Polypodium oxyphyllum, 
oO Dall. 
Has. Nepal. Received from J. Riley, Esq., in 1842. 
- Oss. In some states this may be taken for a Polypodium, but 
I have observed a slight indusium when examined in a young 
state. 
19. L. villosa, Pres? ; Sw. 
Has. Jamaica. Introduced by Mr. Nath. Wilson in 1844. 
20. L. as a a J.Sm. Nephrodium decompositum, R. Br. 
Has. New Holland. Introduced by A. Cunningham, Esg., in 1825. 
21. L. pubescens, Pres]; Sw.; Hort. Kew.; Hook. et Grev. Ic. Fil. t. 162. 
- Oss. The genus Zastrea, as at present constituted, contains a 
considerable number of species, varying much im size and cir- 
cumscription of their fronds, the position of the sori and nature 
of the rhizoma, which on a revision of the genus may afford 
sufficient characters for grouping the species. Although there 
are very distinct and well-marked characters, between what may 
be considered the genuine species of Zastrea and Polystichum ; 
yet of other species it is difficult to say to which of these two 
genera they really belong, and the last enumerated species may 
be cited as an instance. 
60. Porysticuum, Roth (in part); J. Sm. 
(Aspidium sp. Si.) 
1. P. rhizophyllum, Pres? ; Sw.; Hook. et Grev. Ic. Fil. t.59. 
Has. Jamaica. Introduced by Mr. W. Purdie in 1848. 
2. P. acrostichoides, Schott; Sw.; Schk. Crypt. t. 30. 
Has. North America. Cultivated in 1820. 
3. P. falcinellum, Pres?; Sw. 
- Has. Madeira. Cultivated in 1820. 
4. P. mucronatum, Presi; Sw.; Schk. Crypt. t. 29 b. 
Has. Jamaica. Cultivated in 1838. 
* There can be no doubt of this being the same with Nephrodium Fenesecti, 
of the Rev. Mr. Lowe’s ‘ Flora of Madeira,’ published in 1834.—Ep. 
