- 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
Pterosiphonia Falkenberg 1897
Thalli chiefly erect from prostrate branches; erect branches alternately distichous, with subordinate branches of 1 to several orders. Branches cylindrical to strongly compressed, with 4-20 pericentral cells, usually uncorticated. Ultimate branchlets determinate, typically without trichoblasts. Tetrasporangia 1 per segment in straight series, mostly in ultimate branchlets, tetrahedrally divided. Spermatangial stichidia clustered near apices of determinate branchlets or on spurlike branchlets from determinate branches, distichously arranged, with or without sterile apices, arising from entire trichoblast primordium. Cystocarps ovoid to globular, briefly pedicellate.
Pterosiphonia baileyi (Harv.) Falk.
Rytiphlaea baileyi Harvey 1853: 29. Pterosiphonia baileyi (Harv.) Falkenberg 1901: 270; Smith 1944: 367; Dawson 1963b: 426.
Thalli 8-25 cm tall, nearly black, several to many erect branches arising from common base; main axes percurrent, cylindrical, completely corticated, unbranched below, much branched above; branching mostly distichous, tripinnate, the ultimate branchlets subacute, 60-150 µm diam., uncorticated; pericentral cells 12-14; tetrasporangia 80-100 mm diam., in densely congested, incurved branchlets; spermatangial branchlets incurved, terete, blunt, 200-300 µm long, 60-70 µm diam.; cystocarps globular, 700-800 µm diam.
Frequent on rocks, intertidal to subtidal (to 6 m), Crescent City (Del Norte Co.), Calif., to I. San Roque, Baja Calif. Type locality: Monterey Bay, 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.
