163 
Rhizophyllacee follows the development of the frond; in the Cor- 
mophyllacez it precedes it. In some Cormophyllacez there is a ten- 
dency to approach the Rhizophyllacee : this is strikingly the case in 
Dryopteris, Phegopteris, and Thelypteris; but it is only necessary to 
examine the growing apex of the rhizomatiform caudex of these well- 
known ferns, in order to ascertain that it is alvays composed of un- 
developed fronds. There is a plant familiar to every one who has a 
garden, that affords an illustration of the two modes of growth,—the 
common Pyrus japonica. The branches of this beautiful shrub 
always terminate in a bud, composed of undeveloped leaves; such 
branches, therefore, are analogous to the caudex of a cormophylla- 
ceous fern: the roots, on the contrary, spreading horizontally, and 
near the surface of the ground, never terminate in leaves, but possess 
the power of originating leaves and leaf-branches at any part of their 
surface except the growing apex; and not leaves only, but flowers 
also: such leaf-bearing roots are striking analogues of the rhizome of 
rhizophyllaceous ferns. Could we therefore divide a Pyrus japonica 
into branches and roots, we should have representatives of these 
divisions of ferns; the branches would be cormophyllaceous, the roots 
rhizophyllaceous.”— P. vii. 
The generic names have undergone considerable change : — 
Blechnum spicant of 3rd edit. 
EKupteris aquilina 
Ctenopteris vulgaris 
Lomaria spicant of 2nd edit. 
Pteris aquilina 
Polypodium vulgare 
Phyllitis Scolopendrium 
Notolepeum Ceterach 
Scolopendrium vulgare 
Ceterach officinarum 
» Phegopteris =  Gymnocarpium Phegopteris 
= Dryopteris = Ep Dryopteris 
fe calcareum = He Robertianum 
Lastrea Thelypteris =  Hemestheum Thelypteris 
& recurva =  Lophodium feenisecii 
ps multiflora = 9 multiflorum 
as spinosa = a spinosum 
fe cristata = AS Callipteris 
“ rigida = és rigidum 
op Filix-mas =  Dryopteris Filix-mas 
Asplenium Ruta-muraria =  Amesium Ruta-muraria 
oo germanicum — - germanicum 
Hf sep tentrionale = a septentrionale 
