PLANTS SUITABLE FOR VIVARIA. 33 
Besides the above evergreen Ferns, foreign as well as English, 
there are others more beautiful and perhaps more suitable for 
some Vivarium Fern-cases, videlicet, the deservedly popular Filmy 
Ferns. These Ferns are ‘‘ membrane-leaved,’’ hence their generic 
name of Hymenophyllum. They especially flourish in the moist 
atmosphere of a closed Fern-case, and therefore only those 
animals which thrive best in similar surroundings should be 
placed among them. The following Filmy Ferns are recommended : 
SSS ay 
SOSH 2S 
_— 7 “) i\ i) 
SESE 
ea OS 
i 
Ske by as, . YS OG, 
ras ie NS 
NSN ‘A 
7a Za Mo 
FE \\\ | Dll 4 
DAgh IX iN 
af d A ‘ ‘ 
KX 
Fig. 21.—TODEA PELLUCIDa. 
The Tunbridge Filmy Fern (Hymenophyllum Tunbridgense) ; the 
Wilson’s Filmy Fern (Hymenophyllum Wilsonii); the Trans- 
_parent Filmy Fern (Yodea pellucida, Fig. 21); The Beautiful 
Filmy Fern (Yodea superba, Fig. 22); the Killarney Fern 
(Trichomanes radicans). Some of the Selaginellas will grow and 
look very well among the Ferns, such as Selaginella denticulata, 
S. involens, S. apoda, S. Cesia, S. Krauseiana, and also their 
D 
