398 
P. canescens Sm. [696]. The Willows, Hitchin, Herts., v.c. 
20, Sept. 26, 1926. — W. J. Housden. Comm. J. E. Little. 
Leaves from sucker shoots. Mr. Housden was unable to procure 
leaves from the same tree as that [672] from which the flowers 
were obtained, so they are sent under separate covers. — J. E. 
Little. 
Populus alba x tremula ( P . canescens Sm.) Wien, Prater, 
1892. — Dr. K. Rechinger. After a careful examination, com- 
parison with my British specimens and consultation with Mr. 
A. B. Jackson, we came to the conclusion that this is a state of 
P. canescens Sm. We should have liked to see a shoot gathered 
in May or June, and also catkins that would have been conclu- 
sive. We cannot see P. alba or P. tremula in it. Dr. C. E. 
Moss in the Cambridge Flora says : “ Some continental botanists 
regard what is apparently P. canescens as a hybrid of P. alba and 
P. tremula. There seems, however, very little real evidence to 
support this supposition. P. alba and P. tremula are very 
distinct species, and occupy very different climatic regions.” — 
J. Fraser. The poplar is not ordinary P. canescens Smith, and 
would probably be correctly named P. canescens x P. tremula. 
I consider P. canescens Smith to be a good species. — A. Henry. 
Vide K. Rechinger, “Ueber den Polymorphismus der Laub- 
bliitter von Populus canescens Sm.” in Verhandlungen der zoolog. - 
botan. Gesellschaft, Wien (1899). 
Ceratophyllum submersum L. with ripe fruits. Congresbury, 
N. Somerset, Sept. 28, 1926. First seen Sept. 4, in a pond 
40 yards long and communicating with II. Yeo by a ditch. — 
H S. Thompson. This ancient pond is choked with the plant, 
and it may be the station near Congresbury from which Dillenius 
recorded it in 1726. Some of the loose fruits are smooth and 
much smaller, but probably they belong to plants of the same 
species and not to C. cristatum Spruce (see note by A . Bennett 
in W.B.E.C. Report, 1901-2, p. 21). Mrs. Sandwith, of Clifton, 
is investigating this Congresbury plant and others, and preparing 
a paper on Ceratophyllum for Trans. Bristol Nat. Soc. — H. S. 
Thompson. 
Epipadis purpurata Sm. [I. Ref. X. 60]. Near Warlingham, 
Surrey, Aug. 23, 1925. [II. Ref. x. 61]. Near Godstone, Surrey, 
July 12, 1925. I send this to show how large this species some- 
times grows. The plant in question, which was originally shown 
to me by Mr. C. B. Tahourdin, put up 34 of these large flower- 
stems in 1924 and 38 the following year. — J. E. Lousley. 
