Red seaweeds key

How to use the key

Find the category that fits best for the specimen you want to identify:


Crusts or cover on rock, or rugged or loose-laying irregularly branched lumps of calcified algae go to subkey


Thallus upright with round (or rounded) axis or axes in cross section,
not flat in any part go to subkey


Thallus upright and flat or with some flat or flattened parts go to subkey