‘ 617 - 
“ 
Trib. I. Micrasterieae Trevis. (Prosp. della Fler. 'Eugan, p. 59.) 
Thaltus e cellula matrice unlca compositus. u 
1. Trochiseia Kütz. ('), 2. Tetraädron Kütz., 3. Pithiscas K tz., 
4. Closterium Nitzsch, ArthrodiaRafinesg., Pleurosicyos Cord., 
Cylindrocystis Menegh., 5. Stauroceras Kütz., 6. Tetmemorus 
Ralfs, 7. Microphycus ,* ('), Microtheca Ehrenb., 8. Holocystis 
Hass., 9. Micrasterias Ag, Hass., Eutomia Harv., 10. Euastrum . 
Ehrenb.,Hass., 11. Cosmarium Cord, 12. ArthrodesmusEhrenb,., 
Hass., 13. Xanthidium Ehrenb., 14. Staurastrum Meyen, Bina- 
iella Brebiss., Pentasterias, Hewasterias, Heptasterias, Octaste- 
rias, Polyasterias Ehrenb., Phycasirum Ktz., Goniocystis Hass. 
Trib. II. Pediastreae Trev. (Prosp. della Fior. Eagan. p. 58.) 
Thallus e cellulis matricibus pluribus varie nexis, membranula hya- 
. lina symmeltrice insidenlibus, composilus. 
15. Scenedesmus Meyen, Achnanthes, Tessarthonia Turpin, 
Tessararthra Ehrenb., 16. Grammatonema Ktz., GrammonemaA g., 
17. Eucampia Ehrenb., 18. Losanza ‚* (°) Geminella Turpin, 19. 
Merismopoedia Meyen, Agmenellum Brebiss., Gonidium Menegh., 
20. Crucigenia Morren, 21. Pediastrum Meyen, Helierella Turp., 
Oplarium Losana, MicrasteriasEhrenb., Stauridium Corda, 22. 
Monactinus Corda, 23. Asterodiciyon Ehrenb., 24. Sphserastrum 
Meyen, 25. Gomphospharia Ktz., 36. Rhaphidium Ktz., 27. Sor- 
astrum Ktz. 
Trib. II. Desmidieae Trevis. (Prosp. della Flor. Eugan. p. 57.) 
Thallus e celiulis matrieibus pluribus, apieibus Iruncatis cohaeren- 
tibus, in seriem longam continuam filiformem nudam (id est pe- 
ridermide minime obduclam) conjunelis, composilus. 
28. Gymnodesmus,*(*) BambusinaKtz., 29. Gymnozyga Ehrenb., 
30. Spharozosma Corda, Isthmia Menegh.,‘ Schistochilum Ral fs, - 
Isthmosira Ktz., 31. Desmidium Ag. 
Trib. IV. Digymoprieae.* 
Thallus e cellulis matricibus pluribus, apieibus truncalis cohaeren- 
tibus, in seriem lonyam continuam filiformem peridermide geli- 
nea gelalinosa homogenca communi obductam conjunclis, com- 
positus. 
32. Didymoprium Ktz., 33. Gleeoprium Berkel. (Hyalotheca Kt =.) 
Subordo Il. Coccothallae Trevis. 
Trib. V. Protococceae Trevis. 
Trib, VI. Polycocceae Trevis. 
Trib. VII. Coccochloridese Trevis. 
Trib. VII. Hydrureae Menegh. 
Subordo III. Trichothallae* 
(Tiloblastee Ktz. Phycol. gener. p. 178.) 
Divisio 1. Oseillarinae Ktz, (Phycol. german. p. 156.) 
(Gitonothallee Trevis. Att. IV. Riun. Ital. p. 335.) 
(U) (Phyeol. german. p. 129. non in Linnaea VIII. 1833. 
.(2) Microphycus oetoceras,* (Mierotheca oetoceras Ehrenb.) 
(3) Losanaea interrupta,* ıGeminella interrupfa Turpin). 
(4) Gymnodesmus bambusinus,* (Desmidium bambusinum Brebiss,) 
y N 
