- Blue markers: specimen records
- Yellow marker: type locality, if present
- Red markers: endpoints of range from literature
Illustration from DeCew's Guide to the Seaweeds of British Columbia, Washington, Oregon, and Northern California
Odonthalia Lyngbye 1819
Thalli erect, freely branched, with several long, terete to markedly flattened branches, these with or without midrib. Branches basically polysiphonous, distichous, soon heavily corticated by repeated division of the 4 pericentral cells. Tetrasporangia in simple branchlets, these often borne in clusters; 2 opposite pericentral cells of each primary segment producing tetrahedrally divided tetrasporangium. Spermatangia covering surface of short, simple branchlets. Cystocarps clustered on tufted axillary branch lets or borne alternately and distichously on subultimate ramuli.
Odonthalia floccosa (Esp.) Falk.
Fucus floccosus Esper 1802: 42, no. 115. Odonthalia floccosa (Esp.) Falkenberg 1901; 607; Setchell & Gardner 1903: 333; Smith 1944: 375.
Thalli to 40 cm tall, dark brown to black; major branches cylindrical to slightly compressed, +/- 1 mm diam., alternately distichous, with numerous short branchlets clustered on short laterals; branchlets flattened, gradually attenuate to acute apices; fertile branchlets, especially those of cystocarpic specimens, in dense, headlike clusters. Development of reproductive structures as for genus.
Abundant in restricted areas on intertidal rocks subjected to strong surf, S. Br. Columbia to Government Pt. (Santa Barbara Co.), Calif. Type locality: Trinidad (Humboldt Co.), Calif.
Excerpt from Abbott, I. A., & Hollenberg, G. J. (1976). Marine algae of California. Stanford University Press, Stanford, California. xii [xiii] + 827 pp., 701 figs.
