UC specimens and range limits for Sciadophycus stellatus

• 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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Sciadophycus Dawson 1944e

Thalli peltate, with short central stipes. Blades at first circular and entire, then stellate. Branching sympodial from apices of points of blade, the branches forming secondary attachments. Medulla of blade monostromatic; cells large. Cortex of 1 or 2 layers of very small cells. Tetrasporangia cruciately divided, in small, blisterlike nemathecia scattered over blade. Spermatangia unknown; cystocarps superficial, hemispherical, smooth and ostiolate, with network of sterile filaments between gonimoblast and pericarp.

Sciadophycus stellatus Daws.

Dawson l944e: 105; Neushul, Scott, Dahl & Olsen 1967: 195. Fauchea rhizophylla Taylor 1945: 247.

Thalli with primary stipes simple or once-forked, 5-16 mm tall; primary blade deep rose, 4-6 cm broad, with 10-14 radiating points; old plants becoming eroded, losing primary blade; secondary and tertiary blades prostrate, spreading, each subsequent one becoming rounded, 10-15 mm broad, developing 3-5 stellate, stoloniferous attachments.

Infrequent, on subtidal rocks (13-55 m), Channel Is. to San Diego, Calif., to I. Natividad, Baja Calif. and Galapagos Is. Type locality: I. Cedros, Baja Calif. (40-50 m). Usually found in kelp beds (10-30 m) in S. 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.