- Blue markers: specimen records
- Yellow marker: type locality, if present
- Red markers: endpoints of range from literature
Hildenbrandia Nardo 1834
Thalli uncalcified, crustose, closely adherent to substratum, without rhizoids, composed of closely adjoined erect filaments arising from ill-defined basal layers. Perithallus sometimes horizontally stratified. Tetrasporangia in pitlike conceptacles, zonately or cruciately divided, with or without paraphyses. Sexual reproduction unknown.
Hildenbrandia prototypus Nardo
Nardo 1834: 676; Rosenvinge 1909-31 (1917): 202. Hildenbrandia rosea Kützing 1843: 384.
Crusts pale rose red to bright red, 3-5+ cm broad, 50-300(450) µm thick; cells of erect filaments compact, quadrate to slightly anticlinally elongate, mostly 3-4 µm diam.; conceptacles shallow surface depressions to subspherical, 35-110(200) µm diam., 35-80 µm deep; tetrasporangia obliquely cruciately to irregularly divided, 15-28 µm long, 10-12 µm diam.; paraphyses absent or mostly inconspicuous.
Common on rocks, lower intertidal to upper subtidal, Alaska to Oaxaca, Mexico. Nearly worldwide in distribution. Type locality: Italy.
Excerpt from Abbott, I. A., & Hollenberg, G. J. (1976). Marine algae of California. Stanford University Press, Stanford, California. xii [xiii] + 827 pp., 701 figs.
