130 



Family DESMIDIACEAE 



Sub-family Saccodermae 

 Genus Netrium Naegeli 1849, ^^' Luetkemueller 1902. 



12. Netrium oblongum (De Bary) Luetkem. 



De Bary: Conj., Luetkem. Zellmembr. Desm. 1902. 

 Scarce in one or two collections, from Vigil-joch. 



Sub-family Placodermae 

 Genus Penium De Brébisson 1844. 



13. Penium Navicula Breb. 

 De Brébisson : Liste Desm. 



This common species was present in quantities in two col- 

 lections. 



Genus Closterium Nitzsch 181 7. 



14. Closterium abruptum W. West. 

 W. West : Algae Engl. Lake Distr. 



This characteristic species, well-marked with the truncate 

 apex was represented with a few individuals in a single sample. 

 Size : Long. (= dist. apic.) 155 \s., lat. 15 [x. 



15. Closterium didymotocum Corda. 

 Corda in Alm. de Carlsbad. 



In great abundance in one sample from the boggy margins 

 of Schwarze Lacke. The specimens exhibited a considerable range 

 of variation. 



Size : of one individuai, long 410 (jl, lat. 33 ^. 



16. Closterium moniliferum (Bory) Ehrbg. 

 Ehrenberg : Infus. 



In one sample, collected from a horse-trough on Vigil-joch. 

 Size : Long 290 [j-, lat. 52 |j.. Rather stout form, but other- 

 wise typical. 



17. Closterium strlolatum Ehrbg. 

 Ehrenberg : Entwick. Lebenslauf d. Infus. 

 Rather common from Vigil-joch. 



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