15 
the water, had been the chief cause of their compact growth. In this 
state they were remarkably brittle, and broke much both during and 
after the drying process.” — H. C. Watson. 
Potamogeton decipiens, Nolte. Mr. Charles Bailey sends a specimen 
of this plant from the canal at Navan, collected in 1868. Unfortu- 
nately, he was not aware at the time he gathered it that it was a plant 
new to the Irish "Flora, and so brought away only two specimens. 
Potamogeton Lonc/tites, Tuckerm. ? Mr. Charles Bailey also sends 
a few specimens of this plant from the river Boyne, near Navan ; some 
of them are in fruit, and the nuts accord well with the description of 
those of the American plant, being larger, deeper, and more distinctly 
keeled than in P. heterophyllus, and the peduncles are much longer 
than those of the last-named species ; but the submerged leaves of 
Mr. Bailey’s specimens are much more like those of P. heterophyllus 
than those of Dr. D. Moore’s specimens collected in the same river. 
The floating leaves of both plants bear a striking resemblance to those 
of P. polygonifolius, but t*he nuts are totally dissimilar, and the 
branched stems of the plant I suppose to be P. Lonchites form a suffi- 
cient means of distinguishing it when barren, and the peduncles 
thickened upwards when in flower. 
Potamogeton helerophyllus, Schrad. “ This was not believed to be a 
native of Cheshire until I found it at Achmere ; and it is apparently 
a rare plant in the county.” — J. F. Bobinson. 
Juncus glaucus, Sibth., var. pseudo-diffusus. I have sent out, under 
this name, specimens of a plant abundant on the shores of the Firth of 
Forth, between Aberdour and Burntisland. It is a sterile or sub- 
sterile form of J. glaucus, of Avhicli it has the striated glaucous stems 
and interrupted pith, but the flowers are much greener, the capsules 
smaller, and the seeds almost always abortive. It is probably to this 
form that all the Scotch specimens supposed to be Juncus diffusus belong. 
Juncus nigritellus, Don. On the shore of Loch Leven a depaupe- 
rate form of J. lamprocarpus, Ehrh., occurs, confined to the sandy por- 
tions of the shore which are covered with water as late even as the end 
of May. Amongst these, the smaller specimens have the leaves terete, 
but in the larger they are compressed. Last autumn I brought a 
number of roots of the small specimens with terete leaves, and placed 
them in a flower-pot. At the present date (June) the plants are 3 to 
4 inches high, but all of them have compressed leaves. The perianth- 
