BRITISH FERNS. 
finds and by judicious crossing, has never advanced so rapidly as 
it is doing at the present time. 
The nomenclature adopted in this Handbook is that of the late 
Sir William Hooker, as given in his “Synopsis Filicum,” com- 
pleted by Mr. J. G. Baker, F.R.S., Royal Gardens, Kew. In this 
work Sir William Hooker has arranged the British species in the 
following order : — 
SUB-ORDER II. POLYPOD I ACE/E. 
Tribe 2. Dicksoniea:. 
Woodsia ilvensis, R. Brown. 
,, hyperborea, R. Brown. 
Tribe 3. Hymenophyi.le>e. 
Ilymenophyllum Tunbridgense, Smith. 
, , unilaterale, Bory. 
Trichomanes radicans, Swartz. 
Tribe 4. Davallie,e. 
Cystopteris fragilis, Bernhardi. 
,, alpina, Desvaux 
(Cystopteris regia, Desvaux). 
,, montana, Link. 
Tribe 6. Pteride^e. 
Adiantum Capillus- Veneris, Linnaeus. 
Cryptogramme crispa, R. Brown 
(Allosorus crispus, Bernhardi). 
Pteris aquilina, Lin nee us. 
Lomaria Spicant, Desvaux 
(Blechnum Spicant, Smith). 
Tribe 8. Asplenie/e. 
Asplenium viride, Hudson. 
,, Trichomanes, Linnaeus. 
,, septentrionale, Linnaeus. 
,, marinum, Linnaeus. 
,, Germanicum, Weiss. 
,, Ruta-muraria, Linnaeus. 
,, Adiantum-nigrum, Linnaeus. 
,, fontanum, Bernhardi. 
,, lanceolatum, Hudson. 
,, Filix-foemina, Bernhardi. 
(Athyrium Filix-foemina, Roth). 
,, Ceterach, Linnaeus 
(Ceterach officinarum, Willdenow). 
Tribe 9. ScOI.OPENDRIEAi. 
Scolopendrium vulgare, Smith. 
