- Blue markers: specimen records
- Yellow marker: type locality, if present
- Red markers: endpoints of range from literature
Laurencia Lamouroux 1813
Thalli chiefly erect, solitary or tufted, epiphytic or saxicolous; erect axes cylindrical to markedly flattened; branching pinnate or radial. Branch apices blunt, with terminal pit containing single apical cell and rudimentary, evanescent trichoblasts; branches firm to cartilaginous, solidly parenchymatous, with obscure polysiphonous core surrounded by cortex of usually isodiametric cells, these sometimes with lenticular thickenings in walls. Tetrasporangia tetrahedrally divided, scattered in outermost cortical layers of branchlets. Spermatangial branches cylindrical, densely crowded in conceptaclelike terminal pockets. Procarps arising in apical pits; cystocarps morphologically terminal.
Laurencia subopposita (J. Ag.) Setch.
Chondriopsis subopposita J. Agardh 1892: 149. Laurencia subopposita (J. Ag.) Setchell 1914a: 9; Dawson 1963b: 469; Hollenberg & Abbott 1966: 18.
Thalli epiphytic, deep rose red, with branches arising 5-14 cm from entangled or entwined basal attachments, in quiet water occasionally forming globular masses to 30 cm diam., 25 cm tall; branches of several orders of varying lengths, with frequent terminal hooks coiling around host and other branches; individual branches terete, 0.8-2 mm diam.; tetrasporangia 60-80 µm diam., on terminal parts of short branchlets; sexual plants unknown.
Relatively infrequent, on articulated corallines or coarse algae, low intertidal to subtidal (to 15 m), Pebble Beach (Monterey Co.), Calif., to Pta. Eugenio, Baja Calif. Type locality: Santa Barbara, 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.
