Diatoms have silicon in their cell walls. Red tides are caused by exploding populations of diatoms. Red algae are important as a source of commercial agar. In the large kelps, the plant you see is the gametophyte generation. Archegoniophores and antheridiophores are produced by some liverworts.
Male mosses produce pollen.
Acetabularia is a brown alga. Paramylon is the food storage carbohydrate of the green algae. Lycopodium is homosporous. Megaspores develop into female sporophytes. Most ferns are homosporous.