522 NAIADACEAE 



3. Pang. Near Moulsford. Pangbourn. Tidmarsh. 



4. Kennet. Kiiitbury, Beeks in Brltt. Contr. Hampstead Marshall. 



fi. Loddon. Wargrave, Melvill. Windsor, Bolton King. Bray. Haine« 



Hill. Haws Hill. 

 P. pusillum is recorded for all the bordering counties. 



[P. trichoides, Cham, et Schleeht. in Linnaea, ii. (1827) 175, var. Trim- 



meri, Cnsp. in Linn. Soc. Journ. viii. (i860) 273. 

 Top. Bot. 414. Syme, E. B. 51, t. 1420. Nyman, 683. 

 Is recorded for Surrey,] 



P. psctinatiim, Linn. Sp. PI. 127 (1753). Fennel -leaved Ponchceed. 



Top, Bot. 413. Syme, E. B. ix. 52, t. 1422. Nyman, 684. Fl, Oxf, 286. 

 Native. Lacustral. Kivers, ponds, canals. Common. P. July-August. 

 First record. In great abundance at Caversham, Milne and Gordon. 

 Indigenous Bot. 211, 1793. 



Probably the following record also refers to this species. Potnmo- 

 gptton CapiUaceum capituUs ad alas trifidis, Park. 1255-6 (In Thames 

 near Oxford \ Merrett, Pinax, 97, 1666. P. pectimitus, Mr. Bicheno. 

 Mavors Agr. Berks, 1809. 



P. pedinatus is common in all the districts in the slower-moving 

 streams. In the canal between Abingdon and Shrivenham it forms 

 a considerable portion of the vegetation, and is found in the Thames 

 at intervals from Lechlade to Windsor ; also common in the Kennet 

 Canal between Reading and Hungerford, and in the Loddon between 

 Loddon Bridge and Sandford Mill rather frequently. 



Mr. W. T. Dyer, in Journ. Bot. ;i87i) 147, remarked that it was 'the 

 commoner segregate in the Oxford waters.' 



P. pedinatum is recorded for all the bordering counties. 



P. interruptus, Kitaibel in Schultes Oestr. Fl. ed. 2, i. 328 (1814"). 

 P. Jlahellatus, Bab. Man. Brit. Bot. ed. 3, 343 (1851). P. junceus, Fl. 

 Oxf. 286. P. zosteraceus, Bab. Man. Brit. Bot, ed. i, 325, not of Fries. 



Top. Bot. 413. Syme, E. B. ix. 53, t. 1421. Nyman, 684. Fl. Oxf. 286. 



Native. Lacustral. Rivers and swiftly flowing streams. Locall}' 

 abundant, and found in all our larger streams. P. June- 

 August. 



First record. Pofamogeton mille/ulium seu foliis gramineis ramosum, Raii. 

 Syn. 61, in Thames! proj^e Oxoniam, Sherard, Herb. Oxf. about 

 1700. P. Pusillum folio gramineo, caule rotundo, in Thames near 

 Oxford, Merrett, Pinax, 1666, may also be this .'species. Precisely 

 recorded by the author in Rep. of Rec. Club of 1880. 

 An interesting note on this species, by Mr. A. Fryer, who first gave 



a thorough definition of it, will be found in Journ. Bot. 1^1888) 297-299. 

 P. inteiruptus is recorded for all the bordering counties. 



