While updating the NEAS key I naively assumed that the New England Callithamniaceae and Wrangeliaceae were taxonomically sound. I should know better by now. It will take a while to sort it out but for now there are at least two anomalies in need of immediate study Callithamnion sp. 1GWS and Lophothamnion sp. 1GWS. For the former we have collections from Maine and Tasmania (introduced?). The latter is fairly interesting as Lophothamnion is considered a poorly known monotypic genus from Australia. We currently have 5-7 genetic groups assignable to this genus: Australia (n = 3), Bermuda (n = 1(2?)), South Korea (n = 1?) and this NW Atlantic species. Taxonomic work is needed. Pages for Aglaothamnion halliae (Collins) Aponte, D.L. Ballantine & J.N. Norris, Antithamnion cruciatum (C.Agardh) Nägeli (actually in the Ceramiaceae, but completed with all of these other fuzzy reds), Callithamnion corymbosum (Smith) Lyngbye, Callithamnion tetragonum (Withering) S.F.Gray, Gaillona hookeri (Dillwyn) Athanasiadis, Seirospora interrupta (Smith) F.Schmitz and Spermothamnion repens (Dillwyn) Magnus now loaded. Regrettably they are based on a very few pressed specimens in most cases. Better than nothing and a necessary task as part of updating the NEAS key… They join the earlier pages for Plumaria plumosa (Hundson) Kuntze, Ptilota gunneri P.C.Silva, Maggs & L.M.Irvine and Ptilota serrata Kützing. What little I can upload for Antithamnion hubbsii E.Y.Dawson will follow shortly (added link May 13, 2021).
Seaweed of Canada 