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Seaweeds > Division Chlorophyta
Feathery green seaweeds compared
How to tell them apart?
updated Jan 13
These three seaweeds are sometimes confused for one another. Here's more on how to tell them apart.

Mexican green seaweed
Caulerpa mexicana
Scalpel green seaweed
Caulerpa scalpelliformis
Mid-rib or central 'stem' is may be slightly flat to rounded, width usually much narrower than the length of the side 'branches'.
Mid-rib or central 'stem' is flat, width wider or the same as the length of the side 'branches'
Mid-rib or central 'stem' is flat, width wider or the same as the length of the side 'branches'
Side 'branches' are long.
Side 'branches' short.
Side 'branches' short.
Side 'branches' are somewhat flat and sickle shaped with pointed tips. Gradually tapers to a pointed tip.
Side 'branches' are very flat usually with pointed tip.
Side 'branches' are very flat usually with rounded tip.
There is a slight constriction where the side 'branch' attaches to the mid-rib.
   

Delicate feathery green seaweed
Caulerpa sertularioides
Zipper green seaweed
Caulerpa cupressoides
Serrated green seaweed
Caulerpa serrulata
Mid-rib or central 'stem' is cylindrical narrow.
Mid-rib or central 'stem' is flat, width wider than the length of the side 'branches'
Mid-rib or central 'stem' thick, often twisted.
Side 'branches' are varying length.
Side 'branches' very short and tiny.
Side 'branches' very short and tiny.
Side 'branches' are cylindrical with pointed tips.
Side 'branches' are flat usually with pointed tip.
Side 'branches' with pointed tip.
No constriction where the side 'branch' attaches to the mid-rib.
   

These are NOT seaweeds


Fern seagrass
Halophila spinulosa
 

how to tell apart seagrasses and seaweeds

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