| 1. |
Thallus hollow and tubular, one celled thick..…. |
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Thallus not hollow and tibular..... |
2.
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| 2. |
Thallus membranous, 2 celled thick....... |
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Thallus sacate, monostromatic........ |
3.
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| 3. |
Thallus sacate, monostromatic with frilled margin .... |
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Thallus filamentous, thick cell wall......... |
4.
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| 4. |
Thallus filamentous, thick cell wall, basal cell long compared with the width.......... |
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Thallus filamentous branched........ |
5.
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| 5. |
Thallus filamentous branched, lower branches dichotomous....... |
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Thallus erect, feather like, coenocytic......... |
6.
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| 6. |
Thallus feather like branched with precurrent axis, pinnately or radially branched, coenocytic........ |
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Thallus filamentous, netlike blade....... |
7.
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| 7. |
Thallus filamentous forming netlike blade with multicellular axis........... |
Microdictyon
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Thallus filamentous, without forming blade...... |
8.
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| 8. |
Thallus filamentous, closely grouped, forming compact spongy thallus.......... |
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Thallus filamentous, closely grouped forming spongy thallus.................
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9.
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| 9. |
Thallus filamentous, closely fused to form spongy thallus............ |
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Thallus coenocytious.......... |
10.
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| 10 |
Thallus coenocystious organized to form stolon and erect branches.......
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Thallus erect, segmented......... |
11.
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| 11. |
Thallus erect, calcified form flabellated segments.........
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Thallus erect, calcareous, dichotomous branches..... |
12.
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| 12 |
Thallus erect, calcareous, dichotomously branched fan or funnel shaped flabellum.......
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Udotea
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Thallus multi-cellular calcified, branching in 1-3 forming whorl at the top........
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13.
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| 13. |
Thallus multi-cellular, calcified, branching in 1-3 whorls at the top of axis.........
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Thallus solitary, pear shaped, grass green colour............ |
14.
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| 14. |
Thallus solitary pear shaped with fluid filled vesicle....
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Thallus solitary bulb like, clavate vesicle....... |
15.
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| 15. |
Thallus solitary bulb like, clavate vesicle, slightly constricted at the base, vesicle filled with fluid.......
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Thallus solitary forming small colony....... |
16.
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| 16. |
Thallus solitary forming small colony, whitish green color with hairy tip.....
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