28 
not more than one-eighth to one-tenth inch long. The type has not yet 
been found in Britain. Dr. Boswell’s Orkney plant is this, except that 
the style is a little longer and the tuberculation on the margin of the 
fruit is very faint or entirely obsolete, so that it recedes from the 
type in the direction of dSTo. 1. 
4. Z. macrostemon , Gay, Z. palustris, Boreau, FI. du Centre, edit. 
2, p. 603. Z. digym , Brebisson Z. disperma , Salzmann. Ovaries 
usually two, but sometimes three or four. Pedicel none. Fruit three- 
fourth to one line long, sausage-shaped, rarely crenulate. Style half 
as long as the fruit. Stigma small, not crenulate. Stamens 
with a four-celled anther and filament, from half an inch to 
an inch long. The only station within the bounds of our flora 
with which I am acquainted is, ditches of fresh water near the 
Shannon, two miles west of Wicklow, where it was gathered 
by Mr. Jno. Ball. It was pronounced to be the true macrostemon by 
Gay, and a specimen so labelled by the latter is in the Kew Herba- 
rium. Gay’s idea was that 1, 2, and 3 were varieties of one species, 
but that this was distinct. The figures of 1, 2, and 3 in Reichenbach’s 
“ leones” are excellent, but I cannot refer to any satisfactory figure 
of this. It is probable that if the matter were taken in hand by the 
members of the Club, three or four would be found in fresh places. 
Nearly all the specimens which I have seen in British herbaria are in 
the fruiting stage, and we want a supply gathered a month earlier, so 
as to show the stamens. — J. G. Baker. 
Zannichellia ( ?). “ Round Pond, Kensington Gardens, 
Middlesex, July, 1875. This form deserves study. It seems inter- 
mediate between eu-palustris and pedicellata. The arrangement of the 
fruits round their common peduncle recalls the former, and even to 
6ome extent the Orkney plant distributed this year. But the length 
of styles and fruit-stalks would bring it rather to pedicellata had 
it been gathered from brackish, not purely fresh water. (Qv. Can it 
be pedicellata carried in here from the Thames and altered by a long 
colonisation in fresh water ?) ” — J. L. Warkex. As Mr. Warren 
says, this form is quite intermediate between Z. eu-palustris and 
pedicellata. It has the capillary leaves, short common peduncle, and 
style considerably shorter than the fruit which distinguish the 
former; but the nuts as conspicuously stipitate and the exterior 
membranous keel as dentate as in Z. pedicellata. Reichenbach in his 
“ FI. Germ. Excurs.,” p. 7, describes a Z. gilberosa which may be the 
present form, but of this I have no specimens. Pei*haps it is figured 
in Reichenbach’s “ FI. Germ, et Helv.,” but I have not access to 
that work. With regard to the Orkney Zannichellia, it differs from 
authentic specimens of Nolte’s Z. polycarpa, by having longer styles 
