- Blue markers: specimen records
- Yellow marker: type locality, if present
- Red markers: endpoints of range from literature
Melobesia Lamouroux 1812
Thalli lacking genicula, epiphytic, crustose and thin, to 12 cell layers thick near conceptacles, thinner elsewhere. Hypothallium monostromatic; perithallium to 10 cell layers thick; epithallium monostromatic. Secondary pit-connections lacking, intercellular fusions present. Male and female conceptacles uniporate; tetrasporangial conceptacles multiporate; roofs of male and female conceptacles formed by overgrowth of surrounding tissue.
Melobesia mediocris (Fosl.) Setch. & Mason
Lithophyllum zostericolum f. mediocris Foslie 1900a: 5. Melobesia mediocris (Fosl.) Setchell & Mason 1943: 95; Mason 1953: 320 (incl. synonymy); Dawson 1960: 7.
Thalli coalescent, forming thin, irregularly shaped patches; discrete thalli to 2 mm diam., to 200 µm thick; tetrasporangial conceptacles to 210 µm diam., with 9-14 pores; male and female plants also known.
Common on Phyllospadix throughout Calif., less common on Zostera in S. Calif; N. Br. Columbia through Baja Calif. Type locality: Santa Cruz, 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.
