80 HE JOURNAL OF BOTANY 
Potamogeton lucens, var.? Pond by Lough Neagh, Glenary, 
Co. Antrim. No fruit. Smaller than P. lucens, which grows in 
C 
the specimens to be a small state of P. lucens. I have often fou 
the same small-leaved form growing with ordinary lucens, and hay 
noticed it changing Hae Hh mare ropa and typical states such as 
acuminatus or cornutus. d, I have gathered specimens from 
the same rootstock which faints SS ovalifolius M. & K., the 
ordinary typical lucens, and cornutus Presl. It is difficult to name 
imperfect specimens like the present with certainty. In this group 
of Potamogetons, named as one species (P. Proteus) by Chamisso, 
the whole plant is n ecessary in many cases to enable even the most 
skilful botanist to decide between lucens and Zizii, on the one hand, 
or between Zizii and gramineus (heterophyll us) on the other. P. lucens 
has the leaves all shortly stalked, P. Zizii has some of the lower 
leaves sessile, and the upper leaves are often long-stalked ; always, 
sary i in the case of critical forms of Potamogetons to collect as 
complete specimens as possible, especially when neither flowers nor 
fruit are present. Also I would suggest that specimens of P. lucens, 
P. Zizii, and P. gramineus should be collected and sent for distribu- 
tion from as many loca lities as possible. Unless this is done, we 
enus; and many forms which are eit due to temporary con- 
ditions may never recur.” —ALFRED FRYE 
Carex rostrata Stokes, forma. This ‘te nt grew in the little 
mountain lake Llyn Cwn, which is nearly two thousand feet above » 
sea-level, and lies above Cwm Idwal, at the base of the final ascent 
of the Glyder. It was the only form then growing in the lake, 
whence Mr. Griffith in his Flora of Anglesey and Carnarvon records 
= variety elatior Blytt ; and an identical form also grew in Llyn- 
on, the locality for Potamoyeton Grifithii, whence the var. 
sletian has also been recorded. Neither of these rocky mountain 
lakes appears quite likely places for Blytt’s plant, but it may be that 
different seasons may yield varying om and my experience is of 
two years only.—G. Crarmen Dau 
