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DECEW'S GUIDE

Gomontia polyrhiza ( Lagerheim ) Bornet et Flahault
	CONTENTS     FIGURES     ABOUT     INDEXES: Reds · Greens · Browns     KEYS: Browns

Synonyms: Codiolum polyrhizum Lagerheim, Gomontia bornetii Setchell et Gardner, G. caudata Setchell et Gardner, G. habrorhiza Setchell et Gardner Illustrations: Abbott and Hollenberg 1976, p. 119, fig. 82 ( sporophyte ); Burrows 1991, p. 60, fig. 16 ( sporophytes ); Kornmann 1959, p. 230, fig. 1 ( mature sporophytes with zoospores ), p. 231, fig. 2 ( development of gametophyte from zoospore ), p. 232, fig. 4 ( gametes and syngamy ), p. 233, fig. 5 ( development of sporophyte from zygote ), p. 234, fig. 6 ( gametophytes cultured on mussel shells ), fig. 7 ( sporophytes cultured on mussel shells ), p. 236, fig. 9 ( sporophytes from different mussel shells ); Kornmann 1973, p. 7, fig. 5 ( photos: gametophyte development ), p. 8, fig. 6 ( photos: sporophyte development ); Pedersen 1973, p. 147, fig. 2 e ( photo: discoid gametophyte from nature ); Scagel 1966, pl. 10, fig. A ( gametophytic filament ), figs. B & ndash; D ( sporophyte development ); Setchell and Gardner 1920 b, pl. 18, fig. 1 ( gametophytic filament ), fig. 2 ( sporophytes ), pl. 19, figs. 1, 3 ( sporophytes ), fig. 2 ( gametophytic filaments ); Smith 1944, pl. 1, figs. 8 & ndash; 10 ( sporophytes ); pl. 2, figs. 1, 2, ( sporophytes with simple rhizoids ), figs. 3, 4 ( gametophytic filaments ), figs. 6, 7 ( young sporophytes ), fig. 5 ( mature sporophyte with zoospores ); Wilkinson and Burrows 1972, pl. 1 ( photos ): A ( ring-shaped gametophytes ), B ( early filamentous stage of gametophyte ), C ( floating gametophyte ) Life History: uninvestigated in Pacific coast populations; in Europe, alternation of heteromorphic phases, with a vesicular unicellular shell-boring sporophyte that produces quadriflagellate zoospores and a discoid multicellular free-living bisexual gametophyte that produces biflagellate isogametes ( Kornmann 1973; Wilkinson and Burrows 1972; Kornmann 1959 ) Note: Wilkinson and Burrows ( 1972 ) showed that six different species have been confused under the name Gomontia polyrhiza . Tha Pacific coast records of this species undoubtedly apply to a variety of entities, including the shell-boring unicellular sporophyte of Monostroma grevillei , which is indistinguishable from the sporophyte of Gomontia polyrhiza . Its identity can be established by culturing. Taxonomy: Burrows 1991, p. 59; Kornmann 1973; Kornmann 1959

							J	F	M	A	M	J	J	A	S	O	N	D
BRITISH COLUMBIA						Repr													Uncommon, in empty shells throughout the tidal range. Scagel 1957, p. 61. Scagel 1966, p. 108. South 1969, p. 181. Hawkes et al. 1979, p. 90.
						Ster
COLUMBIA RIVER						Repr													Uncommon, growing on empty shells of molluscs and sea urchin skeletons throughout the tidal range. Doty 1947, p. 7.
						Ster
CAPE ARAGO						Repr
						Ster
CAPE MENDOCINO						Repr
						Ster
POINT ARENA						Repr													Uncommon, on shells throughout the tidal range. Kjeldsen 1995, p. 8.
						Ster
SAN FRANCISCO						Repr													Uncommon, on empty shells of mussels and clams throughout the tidal range. Smith 1944, p. 41.
						Ster