70 THE JOURNAL OF BOTANY 
hydrum. If correctly identified, this is another North American 
species found in Japan and not elsewhere recorded. The var. 
Cayugensis Wiegand (in Rhodora, ii. p. 102, 1900), occurs in the 
lakes and rivers of Central New York. I possess a specimen from 
‘‘ Ste. Rose, Quebec, Canada, 10. 7. 1889. D. N. St. Cyr,’ from 
Prof. Macoun; this matches specimens satit me by Mr. Wiegand 
from Cayuga Lake. The floating leaves are larger than in the 
type, the submerged much longer, broader, and with more nume- 
rous veins ;. it is altogether a larger plant in all its parts, including 
the fruit, It is probable it was the form seen by the Rev. HE. J. 
aul in Michigan (Bot. Gazette, 1881, 260). 
HETEROPHYLLUs f, MyRropHYLLUS Morong, N. Amer. Naiad. 24 
(isasy Herr K. Maly has sent this remarkable form from Lake 
Blidnije, Herzegovina, Aug., 1900. A specimen from Leopolds- 
hafen (A. Braun, 1839) comes near this, and specimens in Kovat's 
herbarium are closely alee to, if not identical with it; but speci- 
mens from Sweden so named by Dr. Tiselius do not seem to agree 
with Dr. Robbins’s enn Morong speaks of local conditions 
producing it in the original locality (Apponang Pond, Mass.), but 
this can scarcely be the rae in ee Quinsigamond and Salton- 
stall, U.S.A., where it also o 
LONGUS swiultasiedses his paper on the Potamogetons of 
enoairitae ae shortly petioled, subcoriaceous, and almost floating, 
a state of the plant of which I can find no mention.” I learn from 
Mr. Barclay, of Perth, there are no such specimens in the Perth 
Museum herbarium, nor have I ever seen such, living or dried 
Mr. Barclay suggests that Dr. White afterwards discovered this 
was not prelongus. It is possible the plant seen was P. angustt- 
folius Bertch & Pres] (P. Zizii Roth), as I have seen in Scottish 
collections specimens of this named prelongus 
P. ampxirotius Tuckerm.—Two forms of this occur that do not 
seem to be noted in American floras. One (var. ovalifolius Morong, 
in litt.) has oval, submerged, and semi-coriaceous floating leaves of 
the same shape, giving the plant a facies very different from the 
ordinary state. Another ‘f. amphibius) “in pools nearly dry, E. 
Massachusetts, U.S. i ., 1880, T. Mo orong (N. American Naiadacea, 
p- 17), has the ena smaller than the ordinary plant, and less cori- 
aceous, with the veins far less prominent, and of course cheve is 
no sign of any dimeiged leaves. That the leaves are less coria- 
ceous is rather remarkable, as usually the absence of water contri- 
butes to make them more so. Forms with an extraordinary deve- 
lopment of the submerged leaves occur in Cache Lake and Navy 
sland, Canada, and rather less in Pringle’s Vermont specimens of 
1879; these have the leaves three times the size of the usual plant, 
and well exemplify the vac of the species. Specimens of a 
puzzling plant have been sent by Prof. Macoun from ‘‘ Chilliwack 
ae ae Columbia (lat. 49° and 49° 10’, and long. 121° 25’ 
122°). No. 26816, 21. 8. 1900. J.M.Macoun. International. 
Boundary diaonnltodien Collection.” In my notes to Prof. Macoun 
