What different of fungi in seaweeds

Seaweeds are autotrophs, containing photosynthetic pigments meanwhile fungi are heterotrophs and are capable of digesting external non living organic materialand absorbing simple nutrients by the fungal hypae

Explanation:

Fungi are eukaryotic organisms, like plants and animals. Unlike plants, they don't perform photosynthesis and they have chitin, a derivative of glucose, in their cell walls. Like animals, fungi are heterotrophs, which means they get their nutrients by absorbing them.