40 J. O. HAGSTRÖM, CRITICAL RESEARCHES ON THE POTAMOGETONS. 



P. drupaccus Lang, Fragmente etc. in Flora II, 1846, 476. — P. flabellatus Babing- 

 ton, Manual of Brit. Bot. ed. 3, 1851, 343. — P. vaginalis Fischer, Verzeichn. 

 Gef. pfl. Xeuvorpomm. 1861, 40. — P. filicaulis Schur, Enumeratio pl. transsilv. 

 1866, 633. — P. latifolius Morong, Najadacea? of N. Amer. 1893, 52, tab. 59. — 

 Figg. 15, 16, 17, 18. 



>P. pecli natuin — ■ — Habitat in Europas fossis & paludibus> Linné 1. c. This 

 species is not mentioned in bis travels nor does he record an} r Swedisli station in 

 his Flora Suecica. It is tberefore likely Linné had not studied tbe species in nature 

 but had seen only herbarium samples fixed on a paper ( »foliis — — — parallelis»). 

 A t any råte, he has had a fresh-water plant in view. 



P. marinas L., again, is the plant Linné on his Gothland travel observed in 

 brackish water outside the estuary of Gothum-rivulet. It is most completely described 

 of all Potamogeton-STpecies. From the account of the journey we cite (p. 221): — 

 Gothum-åen - — — Örterna här på orten voro besynnerligen kring Gothum-Elfven 

 desse, Hedera — — — Pyrola - — — Anthericum — — — Linnsea; Nympha?a alba 

 & lutea; Alisma; Chara caulibus aculeatis; Potamogeton pusillum fluitans Bocc. hvars 

 caulis var ramosissimus; foliis alternis, lineari-subulatis, angustissimis; ad ramifica- 

 tiones vero caulis notatiis; stipulis latis, amplexicaulibus, e quarum dorso folia soli- 

 taria. And from Flora suecica ed. 2: — Folia stipulis ipsis insident in hac specie, 

 nec stipulse distinctae in alis foliorum, uti reliquis. Consequently P. marinus is a 

 plant with abundant and prominent ramification, rich in stem-leaves that are acute 

 and endowed with prominent, amplexicaul, broad sheaths etc. which just coincides 

 with P. pectinatus but not with filiformis Pers. The fact that Linné has twice 

 described the same species is easily accounted for by the above said. E. Fries, 

 again, evidently thinks less of the description than of his gathering the P. fil i form i* 

 at the Linnean station for P. marinus: — locoque ab ipso accurate indicato hic, 

 et nullus alius similis, quotannis colligitur (Summa Veg. p. 216). But, of course, 

 both the species have grown at the same place. 



P. striatus, to which P. australis Phil. might be a synonym, I consider to 

 be a variety of P. pectinatus. Neither the original description, nor descriptions given 

 by different authors after the original specimens, nor specimcns from South America 

 examined by me seem to me to be specifically separated from P. pectinatus. The 

 fruit is not smaller than this species often has (microcarp forms). Leaves and sheaths 

 nearly coincide with »P. zosteraceus* . The broadest leaves certainly attain to a width 

 of 5 mm, but also European forms are met with reaching this measure. The ana- 

 tomy of the stem and leaves does not differ in any essential point. At all events, 

 it is sure that the Sprticean specimens (n. 5886) from the Ecuador Andes, in the 

 Natural Histoiy Museum of Stockholm (Riksmuseum) are nothing else than a form 

 of 'pectinatus. 



I*, zosteraceua B"B. is still in 1907 by G. FlSOHEB considenul as a proper spe- 

 cies yet without any real motivés for such a statement, nor eould they ever be 

 presented. 



