- Blue markers: specimen records
- Yellow marker: type locality, if present
- Red markers: endpoints of range from literature
Pikea Harvey 1853
Thalli with 2 morphological phases: larger, gametangial plants erect, isolated or tufted and arising from small, conical holdfasts; sporangial plants small, crustose, bearing cruciately divided tetrasporangia. Gametangial plants with or without distinct stipe, with or without percurrent axis; major branches somewhat compressed, pinnately branched. Medulla with 1 prominent axial filament, surrounded by rhizoidal filaments, these in mature portions appearing pseudoparenchymatous. Cortex filamentous, of 6-8 dichotomously branched cell rows, forming rigid exterior. Spermatangia superficially produced, in whitish patches at apices of young branches. Development of carpogonial and auxiliary-cell branches as in Farlowia, but differing in formation of gonimoblast in having the cells adjacent to auxiliary cell participating in forming several gonimolobes. Nearly all cells of gonimoblast become carposporangia.
Pikea robusta Abb.
Abbott 1968: 184. Pikea pinnata sensu Smith 1944: 202.
Thalli 20-30(40) cm tall, usually only 1 frond per holdfast, rust red, retaining color on drying; several major branches arising from short stipe, these 1.5-4 mm wide, percurrent, strongly flattened, pinnately branched to 3 or 4 orders, the branches mostly opposite but also irregular; second-order branches as wide as first-order; ultimate branchlets dense, fringing axes closely; tetrasporangia unknown; development of other reproductive structures as for the genus; gonimoblast position on branchlets subapical and differing from that of P. californica in forming wartlike areas and eroding apices of branches.
Infrequent, saxicolous, subtidal (to 20 m), Wash. to Santa Barbara Co., Calif. Type locality: Carmel, 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.
