| 1. |
Thallus erect, foliaceous. Margin entire, majenta colour, stallate chloroplast with central pyrenoid.....
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Thallus tufted, dichotomously branched..... |
2.
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| 2. |
Thallus tufted, dichotomous repeatedly branched mucilaginous or moderately calcified.......... |
Liagora
|
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Thalli erect,radially branched arising from stolonoferous portion............
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3.
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| 3. |
Thalli erect, 10-20 cm tall, fronds plume, cylindrical, bare branches in lower third and densely branched pyramidal shape above......... |
Asparogopsis
|
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Thalli cartilaginous, axes erect, terate to compressed..... |
4.
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| 4. |
Thalli
cartilaginous, terate to compress, saxicolous...... |
Gelidium
|
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Thalli slender, cylindrical stolon........... |
5.
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| 5. |
Thalli cartilaginous, erect, stolon give rise to erect and decumbent branches above and coarse short rhizoidal branches bellow, axial branches are cylindrical or compressed, stichidia are borne on the swollentips....... |
Gelidiella
|
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Thalli bushy, wiry clumps........ |
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| 6. |
Thalli bushy, wiry clumps, lower branches some whatcreeping, upper erect tapering towards the apex Gelidiopsis...... |
|
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Thalli branched axis cylindrical or flattened........ |
7.
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| 7. |
Thalli branched flattened, structurally composed of central medullasurrounded
by cortex |
Gracilaria
|
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Thalli cylindrical, profusely branched bearing short acute alternate branches.... |
8.
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| 8. |
Thalli erect radially branched, cylindrical commonly beset with numerous thorn like branchelets. Tetraspores and cystocarps in swollen alternate branches |
Hypnea
|
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Thalli cylindrical slightly compressed branches |
9.
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| 9. |
Thalli cylindrical with numerous cylindrical or slightlybranches, repeatedly dichotomous, monosporangia produced on mono thecoid enlargement |
Ahnfeltia
|
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Thalli more or less calcarious encrusted |
10.
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| 10. |
Thalli calcareous, epiphytic, genicula absent, hypothallum, monostromatic, secondary pit connection lacking |
Melobasia
|
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Thalli epiphytic, calcified, short apical segment |
11.
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| 11. |
Thalli calcified, epiphytic, forms fine thick pinkish clumps, apical segment shorter and 190-355 μ long |
|
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Thalli calcified, calcification absent at the node.... |
12
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| 12. |
Thallus calcified, branches regular to irregular, dichotomous, calcification absent at nodes.....
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Galaxaura
|
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Thalli calcified, intergenicula swollen..... |
13.
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| 13. |
Thalli calcified, except at the node, cream colour, intergenicula slightly swollen.....
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Amphiroa
|
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Thalli terate, flattened, solid or hollow.......... |
14.
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| 14. |
Thalli terate, flattened, laterally branched, frequently lobbed or proliferous....
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Rhodymenia
|
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Thalli flattened, segmented..... |
15.
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| 15. |
Thalli branched, flattened, sometimes moniliform, segmented by diaphragm....
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Champia
|
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Thalli flat, broadly lobbed.... |
16.
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| 16. |
Thalli flat, broadly lobbed, divided longitudinally into narrow bands...... |
Martensia
|
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Thalli foliaceous, irregularly branched, membranous with mid-rib...... |
17.
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| 17. |
Thalli foliaceous, irregularly branched, membranous with mid-rib |
Caloglossa
|
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Thalli cylindrical, flattened, mid-rib absent...... |
18.
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| 18. |
Thalli cylindrical, flattened, mid-rib absent, radially or laterally branched, constricted into laminated..... |
Catenella
|
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Thalli form bushy clumps erect cartilaginous...... |
19.
|
| 19. |
Thalli erect, reddish to greenish, main axis prominent, determinate branches are arranged along the axis beset with numerous spines........ |
Acanthophora
|
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Thalli erect, cartilaginous, wart like determinate.... |
20.
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| 20. |
Thalli erect, cartilaginous, determinate branches beset with wart like branchlets
|
Laurentia
|
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Thalli
erect, cylindrical, determinate branches acute..
|
21.
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| 21. |
Thalli
erect, cylindrical, delicate in texture, determinate branches acute, stalked antheridia, oval cystocrap..... |
Chondria
|
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Thalli erect, polysiphnous axis..... |
22.
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| 22. |
Thalli
erect, polysiphonous axis with 5 pericental cells, lateral branches alternate or whorled monosiphonous.... |
Dasya
|
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Thalli erect, axis monosiphonous...... |
23.
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| 23. |
Thalli erect, axis and branches at first monosiphonous from apical cell, lateral develops into several pericentral cells
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Polysiphonia
|
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Thalli
terate, filamentous, dichotomously branched........... |
24.
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| 24. |
Thalli erect, filamentous, branched, axial filaments Corticated, nodes without spins |
Ceramium
|
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Thalli erect filamentous, node with
row of spines |
25.
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| 25. |
Thalli erect, filamentous, node surrounded by a row of spines..... |
Centroceras
|
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Thalli
erect, flattened to foiliaceous...... |
|
| 26. |
Thalli erect, flattened with slippery blade, branches pinnate to
irregular, texture firm, dark purple colour |
Grateloupia
|
|
Thalli
cylindrical, variously branched....... |
27.
|
| 27. |
Thalli cylindrical to foliaceous, simple or variously branched,
Tetra sporangia commonly present...... |
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