THE HERBARIUM OF JOHN LIGHTFOOT 969 
the seine are to be Pat distinct. As already Redcat by 
Robinson & Green there seems to be no orphological 
difference of the slightest significance bacsaahi this species and 
ymnolomia microcephala Less. (G. patens Gray), excepting the 
presence of a pappus in this plant and its cbaants | in the other, a 
character which, as in many ne the Helianthoidee, is concomitant 
with the presence or absence of pubescence on the achene. Nor 
e is this the only species backed referable to some other 
which so closely mimics a true member of the genus G2 a pa 
as to suggest a doubt as to the real value 1 in nature of the technical 
There 
are several Viguieras whose similarity to species of ye: ee 
is so great that the only rarest td characters for differentiation 
are to be found in the fruit, and at least one other Hymenostephium 
(H. mexicanum Benth.) is 5 hioes as close to G. microcephala as is 
the species under discussion. The cases of this “mimiery”’ are 
. too numerous and too various in degree to find explanation in the 
fact, well a in this group, of the occurrence of epappose 
achenes in normally pappiferous species, and some other explana- 
tion of these convergences must be sought. It is a problem that 
should engage the pre of collectors in the region where these 
plants occur. 
THE HERBARIUM OF JOHN LIGHTFOOT. 
By JAmes Britten, F.L.S. 
THe information given as to this in Journ. Bot. 1905, 291 
may be supplemented in one or two points. In adding these, it 
will be needful to repeat in part what was said ten years ago, but 
reference must on be made to the remarks, as it is un- 
necessary to cite more than is naédtul to make the present note 
clear. After Lightfoot s death ack: the herbarium was es cg ed 
for £100 by George III. and pba to Queen Charlotte. It 
was kept at Frogmore, where it was iscaaited | by Goodenough, 
in 1791, when preparing his paper on seimer ip i (see Trans. 
2 Linn. Soc. ii. 141); at this time it was ery bad state, 
‘- and at Goodenough’s suggestion, Smith was pleat, to preserve 
‘what remained” (S es 90). 
> In Rees’s Cyclop. s.v. Lightfoot, Smith describes it as “an 
excellent British herbarium, consisting of abundant capt 
. generally gathered wild, and in many cases important for the 
illustration of his work: he had also amassed, from Sir Foils 
Banks and other fr seid a number of exotic plants.” It con- 
tained the plants of Thomas Yalden (fl. 1750-74) who bequeathed 
4 his collection to Pocapreinas the figure of Salicornia fruticosa of 
. Bot. t. 2467 (not the ie plant) is drawn from one 
w Her Majesty’s aero 
cious given to Mr. Sow cre for 
