- 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 snyderiae Daws.
Dawson 1944d: 98; 1963b: 463.
Thalli rose red, with erect fronds in groups of 2-5 from low, primary stoloniferous clusters, each frond a limp, fleshy, cylindrical division with percurrent axis 8-12 cm long and with several indeterminate branches 2-4 cm long, arising irregularly or often as group from upper portion of main axis, or these sometimes abundant and obscuring distinctness of main axis; entire plant, except usually lower part of main axis, densely clothed with short, determinate, papillate branchlets 1.5-3 mm long; palisade-like surface cells lacking; medullary lenticular thickenings lacking; tetrasporangia and cystocarps borne on papillate branchlets; spermatangial plants not observed.
Occasional on midtidal rocks, Santa Catalina I. and Redondo Beach, Calif, to Scammon Lagoon, Baja Calif., and Gulf of Calif. Type locality: La Jolla, 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.
