340 THE BOTANICAL EXCHANGE CLUB OF THE BRITISH ISLES. 
dophytes and Charads, found either as natives or growing in 
a wild state in Britain, Ireland, and the Channel Isles, by Ceorge 
Claridge Druce. Oxford: Clarendon Press, Jan. 1908. Price 2s. 6^/. 
Interleaved, 3.^. 6(/., pp. xv, 104. Jan. 1908. 
The London Catalogue of British Plants, containing the 
British Phaenogamica, Filices Equisetaceae, Lycopodiaceae, Selagi- 
nellaceae, Marsiliaceae, and Characeae. Tenth Edition. London ; 
J. Bell and Sons. Price g^. Interleaved, is. 3</., pp. 48. Edited 
by W. A. Clarke and Rev. E. S. Marshall. Feb. 1908. 
Monographie der Gattung Taraxacum, von Dr. H. Frei. 
V. Handel-Mazzetti. 4to., pp. 175. 
In this excellent work 58 species of Taraxacum are described 
with most copious synonomy, and with numerous localities given. 
The author has seen the National Collections at Kew and South 
Kensington. 
Our British species are treated as follows : — 
38. T. PALUDOSUM, Schlecht., ex Crepin, ‘ Man. FI. Belg.’ 
Ed. 2, p. 231, i?>66,=Lcfl?iiodon paludosnm, Lightf., ‘FI. Scot.’ 
p. 432, 1777, = T. palustre, Lam., and DC., Syn., ‘FI. Gall.’ 
p. 262, 1806. 
This the author considers to be the ancestral form from which 
T. vulga7-e has been evolved . Between it and T. vulgare, Handel- 
Mazzetti gives a long and interesting account of the intermediate 
(Mittelformen) plants. In fact he cites the t. 553 of English 
Botany as being one of these. Another is figured on t. 55 
(mccccvi), fig. I of Reichenbach’s ‘ Ic. FI. Germ.’ vol. xix., and 
he cites as a Syn. L. palustre., Huds., ‘FI. Ang.’ p. 339, 1778, 
and L. With., ‘ Nat. Arr.’ iii. 679, 1796, T. officinale, 
var. alpinuin, Kling.,and T. udum, T. ruhdnerve, and 7\ ntaculatum, 
Jord. 
He says he has noticed T. vulgare in the Bot. Gard., Vienna, 
change into T. paludosutu when growing in the Alpine part, and 
he believes that paludosum is the ancestral type from which has 
been evolved T. vulgare ; but that T. vulgare is not as yet a com- 
pletely stable species, and, under certain conditions, can revert to 
paludosutu. The more recent species T. vulgare has a better 
capacity for extension. 
