294 
FEENS : BRITISH AND FOREIGN. 
4. H. Tyermanii, Moore ; Gard. Chron. 1871, p. 870, t. 178- 
Davallia Tyermanii, Balter, in Appendix to Hook- 
Syn. Fil. p. 467. — India (non Trop. West Africa as 
stated in Gard. Chron.). 
3. DAVALLIA (p. 75). 
10a. D. Mauritiana, Hook. Sp. Fil. 1, t. 55, B. — Mauri- 
tius. K. 
12a. D. pallida, Mett. ; Bak. in Hook. Syn. Fil, p. 469. D. 
Mooreana, Masters; Gard. Chron. 1869, p. 964. — 
Island of Aneitum. K. 
4. LEUCOSTEGIA (p. 77). 
6a. L. membranulosa, J. Sm. Davallia membranulosa„ 
Wall. ; Hook. Sp. Fil. 1, t. 53, A. — India. 
Obs. — This genus was founded by Presl in 1836, on the 
Davallia immersa of Wallich, to which additional species have 
been added, all having articulate vernation, and closely related 
to true Davallia. Presl also founded another genus on the 
Aspidium nodosum of Blume, which he termed Acrophonis ; 
its vernation is fasciculate and adherent, producing large de- 
compound fronds 2-4 feet in height, having the sori seated on 
the apex of the lacenese, with a lateral attached indusium, 
not technically differing in form from many species of Lastrea. 
While admitting it as a distinct genus, I consider it to be 
naturally allied to Lastrea ; nevertheless, in Moore’s “ Index 
Pilicum ” the whole of the species of Leucostegia are placed 
under Acrophorus ; thus forming an unnatural association, as if 
Davallia canariense was placed in affinity with Lastrea dilatata 
and its allies. Acropliorus nodosa is a native of India, and has 
not yet been introduced in a living state. 
