1) Concerning certain seaweeds 2) Like kelp 3) Like pond scum 4) Like some pond growth 5) Like some pond growths 6) Like some pond life 7) Like some pond vegetation 8) Of or relating to alga 9) Of seaweed 10) Of some pond life 11) Pertaining to kelp 12) Protoctist 13) Related to seaweeds 14) Relating to kelp Found on https://www.crosswordclues.com/clue/algal