UC specimens and range limits for Rhodymenia callophyllidoides

• 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

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

Rhodymenia Greville 1830

Thalli erect or spreading, 2-40 cm tall, usually stipitate from discoid holdfasts, with or without cylindrical stolons; branches firm, bladelike, usually dichotomously or irregularly divided; axial branching sometimes sympodial; medulla of large isodiametric cells grading outwardly to small-celled cortex of 2 or 3 cell layers. Tetrasporangia cruciately divided, scattered over entire blade or branch, or in subterminal or terminal sori, sometimes on small marginal or subterminal bladelets, embedded beneath little-modified cortex or in nemathecia. Spermatangia in small superficial sori; carpogonial branches 3- or 4-celled; base of carposporophyte with small fusion cell; cystocarps prominent, scattered or restricted to branch apices, with thick ostiolate pericarp.

Rhodymenia callophyllidoides Hollenb. & Abb.

Hollenberg & Abbott 1965: 1184.

Thalli closely tufted, erect, without apparent stipes or rhizomatous bases, orange-brown, 6-10 cm tall; blades irregularly dichotomous to fifth order, the divisions mostly less than 1 cm wide through broadest part, divaricately branched at apices; medulla of 3-5 layers of large cells grading through 2 or 3 cortical layers of very small cells. Tetrasporangia in mottled nemathecia, these submarginal and spreading toward center of branches; spermatangia unknown; cystocarps marginal or superficial on upper branches, protuberant, smooth or slightly rostrate.

Abundant on rocks subtidally (to about 20 m), Monterey Bay (type locality); infrequent at Carmel Bay and Channel Is., Calif., and at Bahia Papalote, Baja 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.