18 Rolf Grdnblad, Observationes de Closteriis. 



sengebirges, (Forschungsber. biol. Stat, zu 

 Plon Theil 6. 1898.) 



39. De Toni: Sylloge Algarum omnium hucusque cognita- 



rum. Vol. 1. Patavii 1889. 



40. Turner: The freshwater Algae of East India. (K. Sven- 



ska Vet. Akad. Handl. Bd. 25 ;i 1893.) 



41. Viret: Les Desmidiees de la vallee du Trient. (BuIL 



Bot, Soc. Geneve II Cj. 1909.) 



42. West, W. et West, G. S.: Desmids from Singapore. (Linn. 



Soc. Journ. Bot. vol. 33. 1897.) 

 42 b. A contribution to the Freshwater Algae of the South of 



England. (Journ. R. Micr. Soc. 1897.) 



43. „ On some Desmids of the United States (ibid. 



ibid. 1898.) 



44. „ A monograph of the British Desmidiaceae, 



vol. 1. London 1904. 



45. „ Algae from Burma. (Annals Roy. Bot. Gard. 



Calcutta, vol. 6. 1907.) 



46. de Wildeman: Flore des Algues de Belgique. Bruxelles 1896. 



47. Wittrock et Nordstedt: Algae aquae dulcis exsiccatae. 1877 



1893. 



48. WoUe: Desmids of the United States, etc. Bethle- 



hem 1884. (+Ed. II, 1892.) 



49. „ Freshwater algae. (Bull. Torrey Bot. Club., 



vol. 12. 1885.) 



50. „ Freshwater Algae of the United States. Beth- 



lehem 1887. 



Explicatio figurarum. 



Tabula I. 



Fig. 1—4. Closterium didymotocum Ralfs. Forma typica. 352'i, 



fig. 4, circ. 352/i. 

 5. Forma crassa nob. 352',. 



