NOTES ON THE LICHENS IN SOWERBY's HERBARIUM. 231 
to be admitted, those of one author in every instance encroaching on those 
of others, and including one or more species c assed differently by some 
other writer.* This in itself seems to me a convincing proof that the old 
genus is far more natural than the proposed segregates. I think, however, 
p 
orca. r. Baker has recently detached the bulbous species from 
organs, or at any rate to assign them a co-ordinate value, suc " 
dealing with flowering plants, is certainly opposed to the consensus 
NOTES ON THE LICHENS IN SOWERBY'S HERBARIUM. 
By rue Rev. J. M. Croats, M.A., F.L.S. xp G.S. 
No. I. Usnea—Solorina. 
Having recently been engaged in arranging the lichens in the 
herbarium of the British Museum, I purpose in this and subsequent 
pape make some observations upon several of the more interesting 
specimens in Mr. Sowerby's herbariu For critical purposes, this 
rium, as might be expected, is most valuable, inasmuch as it con- 
t of the identical specimens from which the drawings in 
Smith's * English Botany' were de; h unfortunately in this 
respect, as will afterwards be -seen, it is by no means s plete as 
consequence of the spec having 
d . n pecimens dra 
until quite recently been inaccessible to British lichenists, the figures, 
in several important instances, have hitherto been misunderstood, and 
ferred to species which they do not represent. In addition, however, 
to the specimens figured, it contains many others sent to Mr. pie 
from various parts of Great Britain, which have neither been describ 
nor drawn in the above well-known work, probably from his not having 
> p d. omm 
with that portion of the herbarium, which I have now duly cosine a 
mounted, extending from the genus Usnea to Solorina inclusive, mee FE 
to the order followed in my ‘ Enumeratio ' and in Leighton's * Lic ; 
* 
t Journal of Botany, ix. 9. sqq. 
