72 Dr Lauder Lindsay on tbe Flora of Iceland. 
is undoubtedly possessed, for instance, by Lecanora tartarea 
or L. parella, and by the Lichen lacteus. 
Lecidea fusco- -lutea, Ach., E. B., p. 74, t. 2065, Hook. Br. 
FI, p. 183, vol. 11., Lichen fusco-luteus, Dicks. Crypt. Fascic., 
2. 18, tab. 6, f. 2, may be a variety or form of Lecanora fer- 
ruginea, Huds., of Lecidea vernalis, Ach., or L. sanguineo- 
atra, Ach. Or, according to Nylander [‘‘ Prodr. Licheno- 
graphie Gallie et Algerie,” p. 75], it may be only a musci- 
colous form of Lecanora cerina, Ach., var. gilva, Nyl., or, in 
other words, it is L. cerina, Ach., var. fusco-lutea, Dicks. 
And it occurs to me, further, that it may sometimes be var. 
frigida, Ach. of Lecanora tartarea, Ach., or var. Turneri, 
Sm. of LZ. parella, Ach. 
The Rev. Mr Berkeley refers Byssus cryptarum to “ some 
imperfect lichen.” Ido not know to what lichen to refer it ; 
nor am I satisfied it is a lichen at all! Iam disposed to 
transfer it to either the fungi or alge. All that can be cer- 
tified at present is, that the precise plant intended to be indi- 
cated by the name B. cryptarum cannot possibly be deter- 
mined either by the lichenologist, fungologist, or algologist! 
3. Algw.—Professor Harvey of Dublin writes me regarding 
Ulva plicata: “ U. plicata of ‘ Flora Danica,’ t. 829, may be 
a variety of U. latissima. It is Phycoseris plicata, Kiitz. Sp. 
p- 477.” Fucus muscoides, “ I suppose must be the J’. mus- 
coides of Gunner, not of Linnzus. If so, then it is Desmar- 
estia aculeata when young and feathery.” Conferva eru- 
ginosa, Huds. “ No one knows what itis, unless it be C. | Cla- 
dophora ?| arcta [Dillw.?] which is probable.” Fucus car- 
tilagineus is partly referable to Gelidium cartilagineum, 
Gaill.; but the latter ‘is a native of the Cape of Good Hope, 
not of Iceland.” Fucus spermophorus may be that of — 
Gunner or of Turner. The former occurs in Iceland, and is 
the Gigartina mammillosa, G. and W. The F. spermo- 
phorus, Turn., is the present Phyllophora spermophorus, L., 
and is not a native of Iceland. Fucus gigartinus is partly 
referable to Gigartina pistillata, Lamour, but this “ could 
never have been found in Iceland. It is quite a southern 
plant, barely reaching as far north as Cornwall.” Mr Croall 
of Montrose, the author of the recently published handsome 
