Catalogue of the Flora of Nebraska. 9 



ZYGOPHYTA. 

 7. PALMELLACE^J. 



9. TETRASPORA Ag. 



10. T. BXPLANATA (Kg.) Kirch. Minden. In material collected by Dr. 



Hapeman (Bessey). 



10. SORASTRUM Kg. 



11. S. SPINULOSUM Kg. Minden. In material collected by Dr. Hape- 

 man (Woods). 



11. HYDRODICTYON Roth. 



12. II. utriculatum Roth. Stagnant water, plentiful. Fremont, 

 July 31 (Williams). Lincoln (Bessey). 



12. PEDIASTRUM Meyen. 



13. P. axgulosum (Ehrb.) Menegh. (P. biradiatum Meyen). In 

 material collected by Dr. Hapeman at Minden. (Woo da 



14. P. PERTU8UM Kg. var. clathratum A. Br. (P. duplex Meyen). 

 Minden. In material collected by Dr. Hapeman (Wood- . 



8. PITHOPHORACE^E. 



13. PITHOPHORA Wittr. 



15. P. affixis Nordst. In stagnant or slow running water. Green- 

 wood, July (Williams). 



9. ULOTHRICHACE^E. 



14. STIGEOCLONIUM Kg. 



16. S. fastigiatum Kg. Minden. In material collected by Dr. 

 Hapeman (Bessey). 



15. APHANOCHJETE A. Br. 



17. A. globosa (Nord.) Wolle. form, minor Nordst. growing on 

 Nitella, in material from Minden collected by Dr. Hapeman. 

 (Woods). 



10. DESMIDIACE^E. 



16. DESMIDIUM Ag. 



18. D. BWABTZn Ag. Minden. In material collected by Dr. Hape- 

 man (Bessey). 



17. SPH^ROZOSMA Corda. 



19. P. skrratum Bailey. Minden. In material collected by Dr. 

 Hapeman (Bessey). 



18. SPIROTiENIA Breb. 



20. S. coxdkxsata Breb. In material from Minden, collected by Dr. 

 Hapeman. 



