— 199 
longa et 15 — 7 Iin. Iata. Folia haec breviora rotundata 
interdum sunt retusa, muerone exserto. 
In Ruviis praeserlim rapidioribus forma provenit Ion: 
gtolia, in lacubus majoribus ovalifoha. 
Vidimus lucentem e Borussia (Regiomonü 1.) ex iota 
Germania (Berolini, Lipsiae in duc. Lauenburgico et Me. 
gapolitano, Bremae, Mozasterü, in Palatinatu, prope Hei- 
“delbergam et Wirceburgum 1.), e Silesia et Bohemia, e 
mari Caspico, ex Anglia (in Sussex 1), e Gala (Parisiis 
in Sequana 1. ex Juine fluvio formam longifoliam), ex 
Africa boreali (Desf.) atque e Senegalia (Lac de Ngher 
form. longifoliam) denique ex America boreali (Canada in 
flavio Mistassin 1 eornutum).. ur 
Synonyma. 
Potamogeiton alterä Dodon. Pempt. 4, pı 582%. f 
+ Fontinalis lucens major J Bauh. hist, 3 3.p- IT. f- 
(mala icon) . 
Potamogeion longo serrato folio Tournef. inst.! u 
Potamogeton lucens. F7. dan. t. 195., Cham. Adn. 
"pP. 6.! 'Schld. fl. Bor. 1. p. 1141 Roth fl. Garm. 1. p- 
73. et 2. p. 204., MM. et Koch Deutschl. Fl. 1- p. 848.!, 
Wahlbg. Fl. Sec. 1. p. 106:, Smith Engl. FI. p. 31., 
"Lam. Ene. bot. 5. p. 580. et 12. p. 533. et omnium fere 
auctorum. 
Potamogeton acuminatum Schum. En. pl. 1. p. 9. 
Saell. 1. p..49. FI. dan. t. 1384 ( Forma cornuta). 
Potamogeton longifolium Gay in Eine. bot. 12. p. 535.! 
Pluras hie adjungimus formas, parlim a nobis, partim 
- ab allis inter iropicos ei in exiraneis terris observatas, 
ob fructus defectum haud rite determinandas: 
1.. Potamogeton Gaudichaudii. Planta gracilis P. Iu- 
centi admodum similis, inflorescentia differre videtur, 
fruetu non viso hand iute definienda. Folia elliptica, 
ulrinque acuta, breviter peliolata, nervo medio crasso ex- 
