Where does “Laminariales” come from?

Laminariales (Translingual) comes from Translingual Laminaria, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “Laminariales”, step by step

Step	Language	Word	Meaning
1	Translingual	Laminaria	—
2	Latin	-ārius	—
3	Proto-Italic	*-āzios	—

Laminariales — Etymology, Origin & Word History | Etymology Explorer