181 



— — var. angustifolius Fieb. 



This form with long- and narrow leaves is in Asia-Media and 

 India more frequent than the typical form. 

 N. 1678. Buchara, in the pond „Hafs-i-Pasha-Chodsha". May 16. 1899. 



6. P. Friesii Rupr. ? P. mucronalus Schrad. 



Mr. Hagström means this is an intermediate form between 



P. Friesii and P. rutilus Wolfg. 



N. 1117. Pamir, in the lake Jashil Kul, depth 1—2». Alt. 3800'". Aug. 15. 

 1898. 



7. P. pectinatus L. 



N. 2130. In the Caspian See by Krasnowodsk, depth 1"". Sept. 7. 1899. 



8. P. amblyophyllus C. A. Meyer (Beitr. z. Pfianzenk. des 

 russ. Reiches. St. Petersburg 1849. 6. lief. p. 10). This species 

 belongs to the group Coleogeton and under this nearest to the 

 fiUforinis-gron'p. Meyer says ., proximo ad P. pectinatiim accedit" ; 

 several botanists take it for a form of P. filiformis, but the fruit 

 is different, and by the broad leaves, whose point is at least as 

 broad as the middle of the leaves, and by the short rigid ligulae 

 this species is sufficiently distingued from P. filiformis. — The 

 plant agrees perfectly with the original (fructiferous) specimens 

 from the museum of Helsingfors. — The localities indicated by 

 Meyer (Kasbek Kaukasus and Jahagan Altai) might make it pro- 

 bable, that P. amblyophyllus were to be found in the Pamir. 



N. 711. Pamir, in swamps by the river Murghab, in stagnant water. 



Alt. 8800». July 8. 1898. 

 N. 712. Ibid, in running water. 

 N. 1456. Pamir, prov. Wakhan (Ishkashim), iu running water by Nut. 



Alt. 2700». Oct. 3. 1898. 



9. P. filiformis Pers. 



N. 689. Pamir, in a pond by the lake Kara Kul. Alt. 4000». July 1. 



1898. 

 N. 879. Pamir, in swamps by the river Alitshur. Alt. 3800». July 22. 



1898. 

 N. 1102. Pamir, in the lake Jashil Kul, depth 0,5». Alt. 3800». Aug. 13. 



1898. 



