UC specimens and range limits for Zonaria farlowii

• 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

Notes: A southern species, more common in Mexico. In Ventura, Orange, Los Angeles and San Diego cos., including San Nicolas, Santa Catalina, and San Clemente islands.

Status: A distinctive species, despite the variability in blade form. It has not been studied with molecular methods.

Habitat: Low intertidal and shallow subtidal understory community, sheltered to moderately exposed

Life History: Alternation of isomorphic generations

Search Sequences in GenBank

Zonaria C. Agardh 1817

Thalli erect to somewhat decumbent, with prominently felted base. Growth in apical row of cells. Blades flabellately divided, without midrib, becoming stipitate below with eroding of marginal tissue. Medulla with several cell layers, the cells arranged bricklike in precise rows in 3 dimensions; surface layer with pigmented cells in mostly longitudinal rows. Sporangia and gametangia on separate thalli, in scattered sori on both surfaces of blades; sporangia with paraphyses; aplanospores 8 per sporangium.

Zonaria farlowii S. & G.

Setchell & Gardner 1924b: 11; 1925: 660; Haupt 1932: 239.

Thalli profusely flabellate, 8-15(30) cm tall, the terminal lobes often split into many narrow divisions, the lobe apices usually lighter-colored than main portions of blades; sori scattered; sporangial sori prominent, with multicellular paraphyses; gametangial sori on different plants, both kinds without paraphyses.

Common on rocks, lower intertidal to subtidal (20 m), Santa Barbara, Calif., to I. Magdalena, Baja Calif. Type locality: "So. Calif."

Oogonia require a lunar month to develop and are produced in periodic crops. Sporangia require a longer period to develop and are not mature at the same time on a given thallus. Unlike other Dictyotales that have been investigated, Zonaria possesses pyrenoids in the discoid chloroplasts.

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

Notes: Type locality is San Diego, California; lectotype is UC99681, leg. D. Cleveland, fide Pedroche & Silva 1990.