66 TWO NEW POTAMOGETONS. 
ingle Welsh lake, and the alteration that may take plac 
janlation should be well consi ype) petnan) 2 after the evidence 
. F. Day has brought together from the zoological point, t.¢., 
among the British Salmonide. Still it is impossible to refer 
Mr. Griffith’s specimens to any known species of Potamogeton, and 
equally so to place it under ne a as a sub-species. 
tamogeton Cheesemanii, n.sp.—Stem simple (?), striated, 
internodes strongly sacked by an S ebecine annulus. Lower leaves 
alternate, strap-shaped, gradually attenuated into the petiole, re 
ew 
most coriaceous, 11-15 ast eed with very numerous cross veins, 
and close areolation all over the leaf when held against the light. 
Stipules broad, subacute, very translucent, and soon decaying. 
spikes dense flowered, oblong-cylindrical, sepals (perianth leaves) 
transversely rhombic- iiginias Fruit small, roundish ovate, 
slightly esi ion carinated on the back, with a short terminal 
beak. a rved to one-half its base. Lower —_ + in. 
ong. in 
Habitat.—New Zealand, St. John’s Lake, Novth Island, Decem- 
ber, 1881 ; Me? ~. a Cheeseman, to whom I am indebted for a 
fine series of the 
ed s mia from Mr. Kirk are in the Herbarium at 
and an oe — in Herb. Brit. Mus., 
Colenso, i probably the s 
with P. ata spobppinijolina, &e., having a — 
nti: ce ae P. natans, var. minor Hook. Fl. Tasmania (non 
et K.*) ii. 41; but the mesa in Herb. Kew., and one in my own 
sepia (for which, with other Australian species, I am indebted 
o Sir F. Mueller), have the leaves quite those of the Linnean 
ei except as to size. = natans L. and polygonifolius Pour. 
both occur in New Zealan 
OTAMOGETON PERFOLIATUS L., var. — F. A. Lees in Rep. 
Bot. Rec. Club, 1880, p. 150.—This curious variety, as I think, 
* Chamisso (‘ Linnea,’ 1827, p. 216) refers _ to P. oblongus Viv. oy sci, Foe 
Pour.), but it belongs to natans L. herb., as an authentic specimen from 
