| 1. |
The algal cell is uninuclear |
| |
 |
2 |
|
| 1. |
The algal cell is multinucleate |
| |
|
5 |
|
| 2. |
The alga is filamentous |
| |
|
3 |
|
| 2. |
The alga has a foliaceous or siphoneous form |
| |
|
4 |
|
| 3. |
The filament is simple and not branched |
| |
|
Ulotrichaceae |
|
| 3. |
The filament is branched |
| |
|
Chaetophoraceae |
|
| 4. |
The alga has a membrane with monolayer cells |
| |
|
Monostromataceae |
|
| 4. |
The alga has a membrane or siphoneous form with biseriate cells |
| |
|
Ulvaceae |
|
| 5. |
The alga is multicellular and multinucleate |
| |
|
6 |
|
| 5. |
The alga is unicellular coenocytic. Cell compartments exist only during reproduction |
| |
|
10 |
|
| 6. |
The alga performs fragmentation and has disc chromatophore |
| |
|
7 |
|
| 6. |
The alga does not perform fragmentation and has reticulate chromatophore |
| |
|
9 |
|
| 7. |
The alga has reticulate branching |
| |
|
Boodleaceae |
|
| 7. |
The alga doesn’t have reticulate branching |
| |
|
8 |
|
| 8. |
The alga is composed of clavate coenocyte, with a clear main axis |
| |
|
Siphonocladaceae |
|
| 8. |
The alga is composed of one or more globate or clavate sac cells without a clear main axis |
| |
|
Valoniaceae |
|
| 9. |
The alga is filamentous and the cells do not divide laterally |
| |
|
Cladophoraceae |
|
| 9. |
The alga is dictyo and the cells divide laterally |
| |
|
Anadyomenaceae |
|
| 10. |
The alga has verticillate branches and is radically symmetric |
| |
|
11 |
|
| 10. |
The alga doesn’t have verticillate branches, and it is not radically symmetric |
| |
|
12 |
|
| 11. |
The alga is umbraculiferous |
| |
|
Polyphysaceae |
|
| 11. |
The alga is not umbraculiferous |
| |
|
Dasycladaceae |
|
| 12. |
The trichome is pinnate and dichotomous |
| |
|
Bryopsidaceae |
|
| 12. |
The trichome is not pinnate and dichotomous |
| |
|
13 |
|
| 13. |
The trichome has loose dichotomous branching |
| |
|
Udoteaceae |
|
| 13. |
The trichome has closely connected cells that are not easy separable |
| |
|
14 |
|
| 14. |
The alga has many segments |
| |
|
Halimedaceae |
|
| 14. |
The alga is unarticulate |
| |
|
15 |
|
| 15. |
The alga has differentiated erect stem and stolon |
| |
|
Caulerpaceae |
|
| 15. |
The alga doesn’t have differentiated erect stem or stolon; the trichomes intertwist into a spongy shape |
| |
|
Codiaceae |
|
Green algae:
