REPORT FOR l888. 
235 
have ripe fruit.) I cannot call to mind any book in which the sugges- 
tion of hybridity is mentioned or expressed ; but if this should be 
proved, it may well be that our plant is equally the plant of Roth, 
and having merely climatal or stational differences. I hesitate much 
to speak with any certainty on this, Mr. Fryer having had the 
opportunity of watching his specimens through all the stages of 
growth except fruiting. Mr. Fryer suggests that the major part of 
the specimens we get of continental fluitans are really only the upper 
part of the stem ; and among a large series of fluitans from the area 
of the species, I have only two examples that have the submerged 
leaves to any extent, and two other examples named, at first, by Dr. 
Tiselius, P. fluitans, in 1881, but in 1885, referred by him to a 
probable cross 11 P. natans x. gramineus,” with very narrow leaves, and 
in abundance. As yet I have failed to see a specimen named by 
Roth (if such are in existence), but nothing so close to Roth’s plant, 
as usually so considered, has ever before been found in Britain. 
Fruit must be patiently waited for ; that it will come may be fairly 
considered as a safe suggestion. In one case, in the United States, 
fruit was procured thirty years after the species had first been 
discovered : and in the case of Smith’s P. lanceolatus, an interval of 
eighty years occurred before a ripe fruit was seen.” — Arthur Bennett. 
Potamogeton fluitans , ‘Roth.’ I send a supply of this species from 
the Wey and Arun Canal, West Sussex, August, 1888, and Surrey, 19th 
August, 1888. For details as to different states assumed by this plant 
at different seasons Mr. Alfred Fryer’s paper (‘Journ. Bot.,’ 1888, p. 
273) should be consulted. — W. H. Beeby. 
P. rufescens, Schrad., Muckross, Lower Lake, Killarney, June, 
1888. R. W. Scully. “ Is probably the large state named maximus , 
Rohling. A somewhat similar (though larger still) state occurs in 
Surrey.” — Arthur Bennett. 
P. nitens , Web., f. app. v. curvifolius, Hartm. Cahernane, Lower 
Lake, Killarney, August, 1888. — R. W. Scully. “ This recedes from 
the typical curvifolius, Hartm., towards curvifolius , b. longipedunculatus, 
Detharding, in ‘Consp. Plant Megapol.,’1827, p. 15.” — Arthur Bennett. 
P . “ nitens, Weber.” Canal, near Frimley, Surrey, August, 1888. — 
Arthur Bennett. 
P. varians , Morong. Ditch on Broker’s Farm, Witcham, Mead- 
land’s Drove, Mepal, Cambridge, 30th June, 1888, (No, 1,099). — 
Alfred Fryer. New record for County 29. “ These, or similar, 
specimens have been passed by Rev. Morong as his plant. Un- 
doubtedly the American specimens are very near this ; they differ, 
however, in the floating leaves being more tapered into the petiole, 
and the direction of the submerged leaves is more like those of Zizii, 
while Mr. Fryer’s specimens have the submerged leaves more like 
heterophyllus. The stipules also, in Mr. Morong’s specimens, are 
decidedly of a stronger form, and, with the base, more truncate than 
the English specimens. Mr. Morong, on his tickets, gives ‘ P. 
gramineus, L., var. (?) spathuliccformis, Robbin’s, in Gray’s Man. ed. 
5 ; P. spathocformis, Tuckerman, in Herb,’ as synonyms ; but I 
think Mr. Fryer doubts this somewhat.” — Arthur Bennett. 
