I've been keeping a PSL up til now based on taxonomic hierarchy as recognised by Natural History Museum Species Inventory. Seems as good a place as any to go for the definitive view! Anyway, using that conflicts with the approach here on the site. I'm really not hugely fussed, and happy to cater to both, but thought it would be interesting to understand the links.
Up til now, I've got
Phylum Oomycota ... species Albugo candida (white crud "gall" on Shepherd's Purse)
Phylum Ochrophyta... 11 species of "brown seaweeds" - kelps, wracks, etc.
Phylum Chlorophyta... 2 species of "green seaweeds"
Phylum Rhodophyta...3 species of "red seaweeds"
For the PSL site, I've bunged this lot into Algae. Is that what's expected? Suspect maybe the Albugo candida might go elsewhere?