UC specimens and range limits for Spyridia filamentosa

• 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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Spyridia Harvey 1833

Thalli erect, terete, bushy, richly branched, with central axes of large cells, wholly corticated by elongate cells in main axes. Branches irregular, attenuate, corticated only at nodes, with or without spines on corticated areas, with or without spines or hooks at apex. Cortical cells in lower portions of main axis and in larger lateral branches having internal rhizoids; short, spinelike branches frequently covering larger lateral branches. Cells uninucleate. Tetrasporangia tetrahedrally divided, borne at nodes of lateral branches. Spermatangia in colorless patches at nodes. Gonimoblasts with 1-3 gonimolobes, surrounded by involucre of branched, sterile filaments; nearly all cells of gonimoblast becoming carposporangia.

Spyridia filamentosa (Wulf.) Harv.

Fucus filamentosus Wulfen 1803-5: 64. Spyridia filamentosa (Wulf.) Harvey 1833a: 336; Dawson 1962: 69.

Thalli rose red, tufted, 5-20 cm tall, variously branched, thickly beset with short, spinelike branches, giving fuzzy appearance; Calif. specimens all sterile and showing attenuate laterals without terminal hooks or spines.

Epiphytic; infrequent in Calif. (La olla); occasional in Baja Calif.; abundant in lower Gulf of Calif. (near La Paz). Widely distributed in subtropics and tropics. Type locality: Adriatic.

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