230 THE BOTANICAL EXCHANGE CLUB THE BRITISH ISLES. 
of C. tuberosus. A similar looking plant gathered at Cardiflf in 1904 
and 1905 alters c insiderably under cultivation, the leaves losing 
their deep lobes and becoming almost entire, and much like those 
of C. pratensis, and the phyllaries becoming broader. Perhaps some 
of the continental referees of the Club may be able to throw light on 
the puzzle. — H. J. Riddelsdell. “ We consider this to be good 
tuberosus. It was reported on inconclusively in the 1904 Report.” 
— A. Ley and W. R. L. “ Very close to tuberosus, but until I have 
seen the roots I still lean rather to its being a pratensis hybrid.” — 
G. C. Druce. 
C. arvensis, Hoffm., var. setosus (Bess.). In abundance in 
a small belt of plantation newly formed near the railway station, Ross, 
Herefordshire, August and September 1906. Unknown hitherto 
in the county, and there is no evidence how it got to its present 
station. — Augustin Ley. 
C- arvensis (Curt.), var. argenteus. Vest. Waste ground, Wells 
Street, Leicester, v.-c. 55, Aug. 1906. My attention was first 
drawn to this thistle by the white appearance of the underside of the 
foliage. It was growing on a bank near the G.C. Railway, and 
well above the street level. When the breeze bent the plants 
over and allowed the sunshine full play on the underside of the 
leaves the contrast with the type — which was equally plentiful — was 
great. At first I thought it might be caused by an attack of 
some insect or fungus ; but on closer examination I believe it to 
be the form argenteus, P'. B. White (Bab. Man. ix. ed.), N C.R — 
W. Bell. “ This seems to blend the characters of vars. mitis, 
Koch., and var. vestiius, Koch. (^—Cirsiuvi argenteum, Vest). 
B. White simply gives the leaf character from Koch and the 
name y. argenteus. Vest. I think it should be called var. argcnteus, 
Vest.” — E. F. Linton. “ I do not know White’s variety. It 
seems to be var. vestitus, Koch., or very near it. The leaf-cutting 
is not bad for mitts. As a variety, White’s name should probably 
stand if given under Cnicus ; for Vest apparently described it as 
a species. If his name is retained, you should write it vestitus 
(Vest).” — E. S. Marshall. “ Hoffman is the authority for 
Cnicus arvensis. This plant appears to answer the description given 
by Mr. F. N. Williams (‘ Prod. FI. Brit.,’ ]). 52) for Cirsium an^ense, 
var. tncanum, Ledeb., i.e. Cirsium arvense, var. vestitum, Wimm. 
and Grab.” — G. Claridge Druce. 
Centaurea Scabiosa, L., var. succiscefolia, Marshall. In small 
quantity in one or two spots on the coast of Gower, Glamorgan, 
v.-c. 41, July 1906. The type with which it grows is in great 
preponderance and attains greater size. There are signs of\ran- 
sition between the forms, possibly owing to ilie action of hybridis- 
