NOTES ON POTAMOGETON 73 
less acute. produced here and there into small knobs, the spaces 
a filled with irregular lines; base of the fruit usually with 
wo small bosses, produced below the fruit attachment, terminated 
es a short style, forming a continuation of the ventral margin; 
not = fruit impressed with very faint raised lines. Embryo in- 
curved, much as in P. alpinus. Stems 16 in. high, rooting at the 
ower branches. Upper leaves 3} x 1}-5} x ¢ in., petioles 43- 
6 in. Lower leaves 54 x 3 in., aa 14-3 in. Stipules 1-1} in. 
Peduncles sah in. Spikes 13 in 
Habitat. Japan (herb. Prof. Kinashi) ; Amori, July, 1902 (ex 
Abbé Faurie) ; vampire (prov. Zizikar), Dr. Litwinow, no. 2424 
aera oe Bri 
inmost confounded this with P. erg ig Presl (P. 
lane Miq.), having seen specimens with only the lower leaves, 
and sition FEN or fruits, and partly a sci sie specimens 
named P. maliana B tenuis Mig. seemed to have the leaves very 
upper leaves also, as is well shown in Morong’s oo of his 
P. Wrightii (= mucronatus), Bull. Torr. Bot. Club, xiii. t. 59 (1886). 
The specimens ou ed by Abbé eer (nos. 4757, 2 805, ** prov. 
Yun-nan, China, 17.8 -1887 ’), and named by m e for M. Franchet 
‘* P. mucronatus Presl,’* are perhaps UH to P. distinctus, but 
the specimens were returned, and I only possess leaf-outlines and 
notes. In Shee many specimens seen by me of P. mucronatus there 
is no trace of SDaRe leaves, but intwo specimens at Kew (Formosa, 
A. Henry, 1203, 1203 a) they are Hae the lower leaves have 
the structure of mucronatus, but there is no fruit, Whether these 
are a form of mucronatus or a new silebiod must remain doubtiu 
until more sinieiiiadsa is availa 
heer Ar. Benn. In the British Museum Herbarium 
there is a sheet of specimens of a Potamogeton from Mauritius, 
oollesiad by Sir J. Vistiecabe | in 1819, that, so far as that island is 
concerned, I have seen in no other herbarium. ere are three 
cross nervation; the upper leaves with numerous nerves, and the 
same outline and consistence of leaf as in sulcatus. There is un- 
fortunately no fruit; the fruit* is so distinct from any other species 
(except perhaps tricarinatus Muell. & Ar. Benn.) that even immature 
examples would have been decisive. Chamisso and Schlechtendahl 
in Linnea, ii. p. 200, 1827, mention nanos received an incomplete 
specimen from the Mauritius eke om the description of it, it 
may have been the plant I men 
ant is of a dist daetly. Ravtsalign type, represented in 
N, N. Auperion by Pu vgn cated and 1 yylchey ; in 8. Ameria by an 
* d.e. of sulcatus. 
