| Answer | Crossword Clue |
|---|---|
| hydrophytes | HYDROPHYTE, an aquatic plant; an alga |
| hydrophyte | an aquatic plant; an alga |
| holdfasts | A stalked organ by which an alga or other simple aquatic plant or animal is attached to a substrate |
| holdfast | A stalked organ by which an alga or other simple aquatic plant or animal is attached to a substrate |
| chlorella | A common single-celled green alga of both terrestrial and aquatic habitats, frequently turning stagnant water an opaque green |
