Which term refers to structures that are similar to roots and anchor brown algae to the substrate?

Question

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Holdfasts are specialized structures that are similar to roots and help brown algae to anchor themselves to the substrate. Thalli refer to the entire body of the algae, blades are the leaf-like structures that protrude from the stipe, and stipes are the stem-like structures that connect the holdfast to the blades.

Which Term Refers to Structures That Are Similar to Roots