| 1. |
Thallus
filamentous, tufted, less than 5 cm tall, much branched ………
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|
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Thallus
filamentous branched ………………………………..
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2.
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2.
|
Thallus filamentous, branched, intercalary growth, sexual plant
bears plurilocular gametangia ………
|
Ectocarpus.
|
|
Thallus filamentous, crustaceous, bears slender thread ………………
|
3.
|
| 3
|
Thallus
filamentous, crusataceous, bears slender bifercate with rudiment
thread ……………………..
|
|
|
Thallus
filamentous, decumbent ……………………
… |
4.
|
|
4.
|
Thallus filamentous, decumbent below and erect above …………
|
Ralfsia
|
|
Thallus tubular, cylindrical or compressed ……………
|
5.
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| 5.
|
Thallus
tubular, cylindrical or compressed branching sparsely, pseudodichotomous
……………………………
|
|
|
Thallus
with expanded blade ……………………………..
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6.
|
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6.
|
Thallus
expanded, hollow spherical ………………………..
|
|
|
Thallus
erect and spongy ……………………………………...
|
7.
|
|
7.
|
Thallus
erct, net like spongy, sub-spherical to irregular, paranchymatous
……………..…………………….
|
Hydroclathrus.
|
|
Thallus
erect, braches without mid-rib. ………………
|
8.
|
| 8. |
Thallus erect, dichotomously branched with rounded apex, unilocular
sporangia ………………………….
|
|
|
Thallus broad, sparsely branched without mid-rib…
|
9.
|
|
9.
|
Thallus broad, erect, margin entire, branches irregularly dichotomous
………………………………………..
|
|
|
Thallus erect, dark brown, dichotomously branched …
|
10.
|
| 10. |
Thallus
erect, dichotomously branched sporangia
under surface of the blade. ……………………………..
|
|
|
Thallus erect branched with mid-rib ………………………..
|
11.
|
| 11. |
Thallus
erect, branched with distinct mid-rib, branching irregularly dichotomous…………………………
|
Dictyopteris
|
|
Thallus
entire, lobbed ………….………. ………………………….
|
12.
|
| 12. |
Thallus
entire lobbed,2-8 celled thick marked with concentric row of hairs
………………….………………………….
|
Padina
|
|
Plant erect, axis cylindrical bearing leaves and vesicles …
|
13.
|
|
13
|
.
Plant with erect axis, branched, leaves membranous, prominent
med rib, receptacles axially ……….……..
|
Sargassum.
|
|
Plant
erect, branched, receptacles not axially …………..
|
14.
|
|
14.
|
Plant moderate size, main axis and branches elongated, cylindrical
or compressed, receptacles in the terminal branch ………………
|
Cystoseira
|
|
Plant erect, branched, leaves turbinate …………………….
|
15.
|
| 15. |
Plant erect, leaves turbinate consists of a subterate stalk, margin
dented, receptacles in cluster……………………
|
Turbinaria
|
