EXPLANATION OF THE PLATES. 
leaflets changing to fruit; y, ditto, with the leaflets cleft (multiftdum ).— Fig. 
8, varieties of Aspl. filix-fcemina ; a, fl, common var. ; y, var. irriguum 
(from Mr. Merrick) ; £, ditto, (fiom Mr. Pamplin;) i, ditto, (from llcv. W. 
Bree ) — Fig. 9, a, the Irish var. of Aspl. adiantum nigrum; /3, pinnule of the 
plant found by Dr. Emerson, (see note, page 41.) In these two, the small 
outline fronds show the part of the plant represented below them. — y, 
Woodsia ilvensis, when luxuriant, sold by nurserymen as W. hyperborea ; 
"> part of a pinnule of a plant sold under the name of W. ilvensis. It is white 
beneath, and exceedingly hairy ; % pinnule of a var. of Aspl. marinum, found 
by Mr. Bree in Cornwall; 9, pinnule of a rigid and ragged-looking Fern, be- 
lieved to grow wild near Sheffield, given on the authority of Lord Fitz- 
william’s gardener, Mr. Cooper. 
ERRATA AND ADDENDA. 
In the Plato of Genera, which took me much trouble to execute, are two 
or three errors. The indusium of Asplenium (No. G) is on the wrong side of 
the sorus ; the theca of Osmunda should open vertically, and not transversely 
as represented ; its stalk, also, is too long. The capsules of Trichomanes and 
Hymenophyllum are not accurate, their ring being transverse. 
Page 12, in the heading of the Order Equisetacco?, for “ Lycopodium,” read 
“ Equisctum.” 
Page 28. — The variety /3 (lonchitidoides ) is considered as belonging rather to 
Aspidium lobatum, than to aculeatum, by Sir W. J. Hooker, Mr. \V. Wilson, 
Rev. W. Bree, and others ; and many specimens which I have lately seen 
incline me to doubt the truth of the note, page 28, and consequently the pro- 
priety of removing the plant from lobatum, where Hooker has placed it. 
Page 33. — To habitats of Aspid. cristat. add, I have reason to believe that the 
true plant grows abundantly on one part of Wimbledon Common, Surrey. 
The exact spot supposed to contain it is the western side of one of the valleys 
near the windmill. 
Page 35, among the varieties of Asp. dilatatum, and in the preceding para- 
graph, for “ reflexum, Bree,” read “recurvum, Bree.” Mr. Bree thinks this 
quite distinct from every state of the plant with which it is here connected; 
but except in habit and having a thicker rachis, I can discover no difference. 
Page 41, line 1, for “ the last,” read “ lanceolatum ;” it being intended to 
compare Aspidium fontanum with that species, and not with Aspidium ruta- 
muraria, which immediately precedes it. 
To the Index add, WOODSIA, 19; W. ilvensis, 20; W. hyperborea, 20. 
