Phaeostrophion irregulare Setchell et Gardner

section of unilocular organs after Setchell and Gardner 1925

Synonyms:

Phaeostrophion australe Dawson

Illustrations:

Abbott and Hollenberg 1976, p. 197, fig. 159 (habit); Dawson 1958, pl. 20, fig. 1 (photo: habit); Mathieson 1967, pls. 64–76 (photos and drawings of various stages in the life history); Scagel 1967, p. 119, fig. 45 (habit and vegetative anatomy); Setchell and Gardner 1925, pl. 38, fig. 36 (x-section, unilocular sorus), pl. 50, fig. 8 (longitudinal section, unilocular sorus), pl. 85 (photo: habit)

Pacific Coast Distribution:

Alaska (Attu I., and Unimak I., Aleutian Is., and Khantaak I., near Yakutat: Mathieson 1965, table XV); northern British Columbia (Striae Is., in N. coast of Graham I., Queen Charlotte Is.: Mathieson 1965, table XV; Melville I.: Hawkes et al. 1979, p. 94); Barkley Sound, Vancouver I., British Columbia (Garbary et al. 1985, p. 44) to Government Point, Santa Barbara Co., California (Dawson 1958, p. 66)

Taxonomy:

Mathieson 1967; Setchell and Gardner 1925, p. 585

Life History:

direct development with possible suppression of meiosis in unilocular sporangia; blades bearing both unilocular and plurilocular sporangia; zooids from both types developing identically, each capable of producing a blade immediately or after a succession of discoid and filamentous plethysmothalli capable of recycling by zooids from unilocular or plurilocular sporangia.

Phenology:

plurilocular sporangia found only in the north

Biology/Ecology:

Sousa and Connell 1992, p. 434; D'Antonio 1986b, p. 267; Turner 1985, p. 86; Turner and Lucas 1985, p. 178; Turner 1983a; Turner 1983b, p. 731; Mathieson 1982a; Mathieson 1982b; Mathieson 1982c; Mathieson 1967; Mathieson 1965

Ultrastructure:

Bourne and Cole 1968