REPORT FOR 1912. 



291 



Potamogeton heterophyllu^^ Schreb. Loch Cluny, Perth, v.-c 89, 

 Aug. 1911.— McT. Cowan, jim. "Yes."— A Bennett. "Yes; the 

 F. gramineus, L., agg. forina loyigijjedu^iciilata, which I have gathered 

 there."— G. C. Druce. 



Potamogeton heterophylJus, Schreb. Lunan Burn, at Marlee Loch, 

 v.-c. 89, Aug. 1911. Mr Bennett says, 'A dark form with much 

 enlarged peduncles.' — McT. Cowan, jun. "Yes." — A. Bennett. 



Potamogeton heteroj^hyllns x angn8tifolius, Bercht. and Presl. 

 Loch Rae, Perthshire, v.-c. 89, Aug. 1911. — McT. Cowan, jun. 

 " ISTo ; this is a form of heterophyllus not common in Europe, but 

 abounds in N. America, especially around the Great Lakes." — 

 A. Bennett. 



Potamogeton obtusifolius, Mert. and Koch, b. Jluinalis, Lange 

 and Mort Loch Cluny, Perth, v.-c. 89, Aug. 1911.— McT. Cowan, 

 jun. " Yes ; the prevailing form in the Perthshire lochs. It is 

 probably the /3 elongata, Cham, and Schlecht (1827) and var. lacustris, 

 Pries Herb. Nor., 5, No. 81, but I have not seen specimens of these." — 

 A. Bennett. 



Potamogeton pusillus, L., var. (?). Silverdale Moss, v.-c. 60, 

 June 1910. In abundance, but could not be found in seasons 1911, 

 1912, although carefully searched for. — J. Cryer. "This form is 

 tending to the var. tenuissimus, Mert. and Koch, but is not that 

 var. by the type specimens, though it comes near to it. It does 

 not exactly fit any of Fischer's numerous forms, but seems to be 

 near his form b. tenuifolius, Fischer, m. Ber. Bayr. Bot. Ges., xi. (1907), 

 115 if." — A. Bennett. 



Potam,ogeton perfoliaUis., L., var. Richardsonii, Journ. Bot. 1889, 

 p. 25, = var. lanceolatus, Bobbins, in Gray's Man. of N. United States, 

 1868. Mill-lade near Selkirk, alt. 350 feet, v.-c. 79, Aug. 4, 1912; 

 teste A. Bennett. — I. M. Hay ward. 



Potamogeton perfoliaius, y ohlongifolius, Mert. and Koch. Mill- 

 lade, Selkirk, v.-c. 79, Aug. 6, 1912; teste A Bennett. I found 

 this growing in great abundance under 5 to 6 feet of running 

 water. — I. M. Hayward. 



Potamogeton Sturrockii, Ar. Benn. Loch Cluny, Perth ; also from 

 Loch Marlee, v.-c. 89, Aug. 1911.— McT. Cowan, jun. "Yes; this 

 has been found rarely in America (Morong!), and in Sable Island, 

 Canada (Macorn !). The above is the third station for E. Perth." — 

 A. Bennett. 



