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Synonyms:
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Codiolum polyrhizum Lagerheim, Gomontia bornetii Setchell et Gardner, G. caudata Setchell et Gardner, G. habrorhiza Setchell et Gardner
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Illustrations:
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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. 2e (photo: discoid gametophyte from nature); Scagel 1966, pl. 10, fig. A (gametophytic filament), figs. B–D (sporophyte development); Setchell and Gardner 1920b, pl. 18, fig. 1 (gametophytic filament), fig. 2 (sporophytes), pl. 19, figs. 1, 3 (sporophytes), fig. 2 (gametophytic filaments); Smith 1944, pl. 1, figs. 8–10 (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)
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Life History:
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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)
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Note:
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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.
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Taxonomy:
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Burrows 1991, p. 59; Kornmann 1973; Kornmann 1959
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