UC specimens and range limits for Calliarthron tuberculosum

• Blue markers: specimen records
• Yellow marker: type locality, if present
• Red markers: endpoints of range from literature

View map from the Consortium of Pacific Northwest Herbaria

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Illustration from DeCew's Guide to the Seaweeds of British Columbia, Washington, Oregon, and Northern California

Calliarthron Manza 1937a

Thalli saxicolous, with crustose bases and geniculate fronds. Fronds dichotomously, pinnately, or irregularly branched. Intergenicula flat, terete, or subterete. Intergenicular medulla of undulate filaments, these forming arching tiers of cells of same length. Genicula with a single tier of long, thick-walled cells. Conceptacles marginal and, in lower parts of fronds, on intergenicular surfaces, 1 to several per intergeniculum, the pore central. Spermatangial conceptacles beaked, the conceptacular canal 100+ µm long. Fusion cell broad and thin, with carposporangial filaments arising from entire surface.

Calliarthron tuberculosum (Post. & Rupr.) Dawson

Corallina tuberculosa Postels & Ruprecht 1840: 20. Calliarthron tuberculosum (Post. & Rupr.) Dawson 1964: 540 (incl. synonymy); Johansen 1969: 1 (incl. synonymy). Calliarthron setchelliae Manza 1937b: 566; Smith 1944: 237.

Fronds to 20+ cm high; branching pinnate, dichotomous, or irregular; upper intergenicula flat or subterete; where upper margins of intergenicula are discernible, angle greater than 60° to axis of branch; intergenicula to 4 mm broad, 2-6 mm long; tetrasporangial, male, and female plants known.

Often extremely common in low tidepools or subtidally in kelp beds and elsewhere, Alaska to I. Cedros, Baja Calif. Type locality: Sitka, Alaska.

Excerpt from Abbott, I. A., & Hollenberg, G. J. (1976). Marine algae of California. Stanford University Press, Stanford, California. xii [xiii] + 827 pp., 701 figs.