APPENDIX. 77 
Lobes of the fecond leaves moft commonly five; two on each fide of 
the rib, and one at the end ; they are of a roundifli figure, grow clofe to¬ 
gether, and are obfcurely crenated round the margin. The colour on the 
upper fide is a brownifii kind of green; the underfide thickly covered 
with a brown hairy nap. 
The lower figure reprefents one of the Tecond leaves, as it appeared 
when a little magnified ; the feed vefiels are difpofed in three or four 
clufters, on each lobe, partly hidden amongft numerous, ftrong, brown, 
hair-like filaments, by which alfo the whole under fide of the leaf, quite 
to the margin, is thickly covered. 
The fpecimen above defcribed is very exadly figured on plate 42, and 
is a plant fo perfedlly diftind: from the Acroftichum ilvenfe, in its ufual 
ftate, that it feems to me unreafonable to fuppofe them both of the fame 
fpecies. 
The Acrofiichum ilvenfe, delcribed in the former part of this work, 
page 14, and accurately figured on plate 9, was brought from Snowden» 
Oeder^ in Flora Da?iica^ has given an excellent figure of the fame plant, 
Tab. 391. And the figure in Pluk. Phyt. Tab. 179, Fig* 4, (which is 
cited by Linnaeus, in Flo. Suecica^ Ed. 2. No. 938,) agrees pretty aptly 
with both Oeder\ and my own : But are all very different from the 
Acroftichum alpinum above defcribed. 
The fpecimen figured on plate 42, was brought from Scotland^ but 
the plant is alfo a native of Soutb-Britain ; for in a volume of dried 
plants, colledled by the late Mr. T. Knowlton, I have feen fpecimens of 
the fame plant, with this note, in his own hand writing, From the 
Mountains of Wales. From thefe, and fome other circumftances, I am 
induced to think, that two fpecies of Britifti Ferns have been confounded 
together, under the name of Acroftichum ilvenfe ; and I believe that 
future obfervation will confirm the truth now difcovered. 
ACROSTICHUM 
