Crossword Genius

Green algae hit Luxor badly (8)

Ross

I believe the answer is:

ulothrix

I'm a little stuck... Click here to teach me more about this clue!

'green algae' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for ulothrix that I've seen before include "Green algae" , "Seaweed" .)

I've seen this clue in The Sunday Times and The Times.
Want a hint initially instead of a full solution? Install my app