5i 6 THK liOTANlCAL EXCHANGE CLUB OF THE BRITISH ISLES. 
although the book-characters are remarkably intermediate, and as 
some botanists would say, “just what I should suspect a hybrid of 
the two species would be,” yet really hybrids are not often such 
a complete half-way house, while it is said that the flowers of 
ochroleuca have quite a different appearance from those of inter- 
media ' ; nor although U. vulgaris and U. major grow together and 
flower freely, has any hybrid yet been observed between these two 
allied species, nor indeed has Focke described one in the genus. 
It may be added that although ochroleuca appears to be the 
boreal or alpine species, yet it prefers open pools in sunny places, 
and in Baden grows in somewhat deep water (i metre), and that 
Gliick places great stress on the foliage characters as a means for 
specific distinction. 
5. U. minor, L., has a census number of 71 (2), which is 
probably too high since U. Bremii and small barren states of 
U. major have been confused with it. The latter may be easily 
detected since mmor has no bristly hairs on the leaf-segments. 
Barren states of Bremii however with our present knowledge cannot 
be safely separated. U. minor is reported from West Cornwall to 
the Orkneys, and in Scotland ascends to 2,250 feet (‘ Ann. Scot. 
Nat. Hist.’ 122, 1907), and it also occurs in Guernsey. 
6. U. Bremii, Heer. This has long been suspected as British ; 
indeed Mr. F. M. Webb (‘Journ. Bot.’ 142, 1876) recorded it 
on faith of a specimen (in Herb. Kew.) gathered by Jas. B. 
Brechan in the Moss of Inshoch, Nairn. Mr. Webb also suggests 
that the flowerless examples from the Isle of Wight (Dr. Bromfield), 
Titchfield Common, Hants (also Bromfield in Hb. Kew.) (see 
‘ FI. Hants,’ 329) should be looked to. Mr. F, N. Williams 
(‘ Prod.’ 349) unhesitatingly refers all these with the plant from 
Gordon Bog, Berwick, and from the Loch of Spynie, Elgin (Hb. 
Winch) to Bremii, although he says of the Inshoch plant “the 
flowers are not recognisable,” while the others are all, I believe, 
barren. But Dr. Gliick tells me one cannot on our present 
knowledge trust to the leaf-characters to distinguish the two species, 
although the dififerences may be suggestive. Fortunately, however, 
he was able to find undoubted U. Bremii in my herbarium, the 
' Professor Trail (‘ A. N. M.S.’) has likewise drawn attention to the probable 
occurrence in Scotland of ochroleuca, and a jiaper on the British Ulriadarias, 
by the Rev. E. E. Linton, appeared in ‘ 'I'rans. But. Soe. Kdinb. ’ 
