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cumque elongatis, simplicibus v. ramosis, continuis sivearticulatis, liberis aut in figuram determinatam, plerumquemateria plastica homogenea interposita, contextis com-posita, tota superficie elementum nutriens haurientia, vivi-partu, partitione v. prolificatione continua, perfectioraspondiis intrinsecus natis, nudis v. intra sporangia inclusispropagata.

Ordo I. Oiatoimiceae.

Diatomaceae, in Botanicorum libris Algarum agmen ducentes,sistunt corpuscula crystalliformia, plerumque lineis rectis circum-scripta, rarissime lineis curvis inclusa, plana, rigida, fragilia, sae-pissime in muco nidulantia, in varias 'formas coeuntia iterumqucsecedentia, vix non omnia e regno vegetabili eliminanda, et ani-malculis microscopicis accensenda.

G e n e n A.

TRIBUS II. IIYDROLINEJB.1.3. Encyonema Ktz.

14. rSydrolinum Link.

§ubordo I. ttlatomeae.

TRJBVSI. FRUSTULJEAE.

1. Frustulia

a. Cyclotella Ktz.

b. Haplotclla Kts.

Scliizonema Ag.Wonema Grev.Girodella GailL

Spermogonia Boiinemais.15. Ilomoeoclatlia Ag,

1(5. Glolodictyon Ag.

17. Hydrurus Ag.

JNavicula bory.'

2. Slyllaria Ag.

Rhabdium IVallr.

3. Meridion Ag .

4. Licmopliora Ag.

Cluzella Bory.Corradorus Gray.

18. Micromega Ag.

\ Caleothrix Desv.

Exillnria Grtv.Psygmatclla Kiilz.

5. Gomplionema Ag.

a. Cymljophora Ktz.

b. Paltonopliova Ktz.

c. Sphenopliora Ktz.

Subordo II. Dcsmidicae»

TRJBVS IU. M1CRASTERJEAE.19. Micrasterias Ag.

Stauvastrum Meyen.Pediastrum Meyen.Sphaerastrnm Meyen.Helierella liory.Potareus Rafin.Crucigenia Morren.Selenaea Nitsch.Heliactis Ktz.

6. Aclinantlies Bory.

Striatella Ag.

7. Isthmia Ag.

8. Diatoma DC.

9. Odontella Ag.

10. Fragilaria Lyjigb.

20. Scenedesmus Meyen.

Tessarthrouia Turjt.

21. Biddulphia Gray,TRJBVS IV. ECIUNeLlEAE.

22. Echinella Ach.

23. Gloionema Ag.

‘24. Desmidium Ag,

Nematoplata Bory.Temacliiiim Wallr.Grunimonema Ag.

11. Lysigonhim LK\

Melosira Ag.Guillonelia Bory.

12. Oncohyrsa Ag.

Ordo II. lostociiinae.

Gelatina organica, varie effigurata, globulis aut filis, sim-

plicibus v. ramosis, continuis v. cellularum oblongarum diametroutraque extremitate coarctalo articulatis, farcta.