120 ENGLISH BOTANY. 
stomates. Similar bodies have been described by Dr. Dickie in the leaves of Pedicu- 
laris, and Professor Busk discovered them in small numbers in the leaves of Hippuris 
vulgaris. On the one hand, they undoubtedly resemble the stellate hairs found in 
Capsella Bursa Pastoris and other Cruciferous plants, whilst their resemblance to some 
of the compound forms of stomates has struck other observers. M. Ad. Chrétien, ina 
paper in the Comptes Rendus, vol. xl., is disposed to regard them as independent 
organs, and calls them “cystides.” He thinks, however, that they are rather modifi- 
cations of stomates than of hairs. These curious organs demand more attention than 
they have hitherto received, and would probably repay the microscopist by further 
researches amongst the species of plants in which they exist. 
Sup-Sreces U.—Callitriche platycarpa. [Kitz 
Prats MCCLXXI. 
Reich. Ic. Fl. Germ. et Helv. Vol. V. Tab. CXXIX. Fig. 4748. 
C. stagnalis, Hegelm. Monogr. p. 58 (non Scop. ?). 
Pollen grains subglobose. Fruit subsessile or shortly stalked, as long 
as or a little shorter than broad, subcordate, flattish on the faces ; mar- 
ginal furrows rather deep; margins of the lobes rather broadly and 
sharply keeled. Styles at length reflexed, persistent. 
In ditches, ponds, and on mud. Common, and generally distributed. 
England, Scotland, Ireland. Perennial, Spring to Autumn. 
Very similar to C. vernalis, but with the fruit nearly twice as large, 
ais inch long, and considerably broader in proportion, with a deeper 
furrow round the margins, generally with a slight tendency to become 
stalked when mature, and of the same pale colour as that of the last; 
the leaves are very similar, and the floating rosette is almost always 
present; when the plant grows out of the water the leaves are 
frequently all obovate, but smaller than when they are floating. 
Dr. Hegelmaier considers that C. stagnalis of Scopoli, which has the 
lobes of the fruit divaricate, is not different from the C. platycarpa of 
Kiitzing, in which the lobes are subparallel, and in that case the name 
C. stagnalis must be adopted for this subspecies. The form with 
divaricate lobes has not been observed in Britain, so far as I am aware. 
Large-fruited Water Starwort. 
French, Callitriche @ fruits larges. German, Breitfriichtiger Wasserstern. 
Sus-Srecizs I1.—Callitriche hamulata. Kits. 
Prats MCCLXXIII. 
Reich. Ic. Fl. Germ. et Helv. Vol. V. Tab. CXXX. Fig. 4749. 
Billot, F\. Gall. et Germ. Exsice. No. 356. Hegelm. Monogr. p. 56. 
C. autumnalis, Kiitz. Reich. Fl. Germ. Excurs. p. 754 (non Linn.). 
C. pedunculata, /, sessilis, Bab. olim. 
. ‘ > =| 
Pollen grains subglobose. Fruit sessile or subsessile, as long as or & 
