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DECEW'S GUIDE

Ulothrix flacca ( Dillwyn ) Thuret
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from Scagel 1966 Synonyms: Ulothrix laetevirens ( Harvey ) Collins, U. pseudoflacca Wille, U. pseudoflacca f. maxima Setchell et Gardner Illustrations: Abbott and Hollenberg 1976, p. 55, figs. 4, 6 ( cellular detail ), fig. 5 ( habit and cellular detail ); Burrows 1991, p. 49, fig. 13 ( cellular detail ): A ( vegetative plant ), B & ndash; D ( reproductive plant with sporangia ), E ( gametangium ); Lokhorst 1979, p. 270, fig. 6 ( vegetative filaments, showing coalescence and cellular detail ), p. 271, fig. 7: a ( filaments with aplanosporangia and zoosporangia ), b ( zoospores ), c, d ( germination of zoospores ); p. 273, fig. 9: a ( filaments with gametangia ), b ( isogametes and zygotes ), c ( germination of zygotes ), d ( fertile sporophyte ), p. 274, fig. 10: a ( fertile sporophytes ), b ( zoospores from sporophyte ), c ( sporophytes with aplanospores ), d ( germination of aplanospores in sporophyte ), e ( parthenogenetic development of gametes in filament ); Scagel 1966, pl. 16, figs. C, K ( juvenile gametophytes ), fig. D ( cellular detail ), fig. E ( zoosporangia ), fig. F ( zoosporangial discharge pores ), fig. G ( aplanospore ), fig. H ( zoospores ), figs. L, M ( branched filaments with cellular detail ); Scagel 1967, p. 39, fig. 7: a ( habit ), b ( basal portion of filament ), c, d ( cellular detail ), e ( zoosporangia ), f ( zoospore ) Pacific Coast Distribution: Alaska ( Amchitka I ., Aleutian Is.: Lebednik and Palmisano 1977, p. 360; Unalaska I ., Aleutian Is.: Setchell and Gardner 1920 b, p. 286; Prince William Sound: Johansen 1971 b, p. 66; Glacier Bay: Saunders 1901, p. 412; Sitka: Setchell and Gardner 1920 b, pp. 285, 286 ); Barkley Sound, Vancouver I ., British Columbia ( Garbary et al. 1985, p. 44 ); Washington ( Fairhaven, Bellingham Bay: Setchell and Gardner 1903, p. 217; Seattle: Thom et al. 1977, p. 270 ); Oregon ( Ecola State Park, Clatsop Co.: Markham and Celestino 1977, p. 257; Cape Arago, Coos Co.: Doty 1947, p. 5; South Slough, Coos Bay: Sanborn and Doty 1947, p. 19 ); Humboldt Co ., Calif. ( Fields Landing, Humboldt Bay and Trinidad: Dawson 1965 a, p. 6 ); San Francisco, Calif. ( Lands End: Gardner 1919, p. 488; Marina: Silva 1979, p. 339 ); Berkeley, Alameda Co ., Calif. ( Silva 1979, p. 339 ); Pacific Grove, Monterey Peninsula, Calif. ( Hollenberg and Abbott 1966, p. 9 [ 619 ] ); Shell Beach, San Luis Obispo Co ., Calif. ( Sparling 1977, p. 28 ); Channel Is ., Calif. ( Santa Catalina I.: Murray 1974, p. 39 ) Taxonomy: Burrows 1991, p. 48; Lokhorst 1979, p. 207 ( see: Taxonomic and Nomenclatural Notes, p. 000 Life History: uninvestigated in Pacific coast populations; in the Netherlands, alternation of bisexual gametophytic filaments with a unicellular sporophyte by means of quadriflagellate zoospores and biflagellate isogametes; filaments recycling by means of aplanospores and zoospores similar to those produced by sporophyte; parthenogenesis occasionally observed ( Lokhorst 1979 ); in France, zygotes germinating immediately to produce sporophytic filaments similar to gametophytic filaments or encysted zygotes forming aplanospores which give rise to unisexual gametophytic filaments that produce anisogametes ( Perrot 1968 ) Biology/Ecology: Thom 1984 a, p. 54; Sibert 1982, p. 209; Lubchenco and Cubit 1980, p. 677; Lokhorst 1979, p. 219; Pomeroy 1977, p. 101; Pomeroy and Stockner 1976, p. 1179; R. Lee 1965 b, p. 111 Chemistry: Dickson et al. 1979, p. 4 Ultrastructure: Lokhorst 1979, p. 217

							J	F	M	A	M	J	J	A	S	O	N	D
BRITISH COLUMBIA						Repr													Uncommon, on other algae, rocks, and wood throughout the tidal range. Scagel 1957, pp. 32, 33. Scagel 1966, pp. 27, 29.
						Ster
COLUMBIA RIVER						Repr													Uncommon, on rocks in upper and mid intertidal. Doty 1947, p. 5. Sanborn and Doty 1947, p. 19. Markham and Celestino 1977, p. 257.
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CAPE ARAGO						Repr													Uncommon, on pilings, old iron, and Fucus in the upper and mid intertidal. Dawson 1965 a, p. 6.
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CAPE MENDOCINO						Repr
						Ster
POINT ARENA						Repr
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SAN FRANCISCO						Repr													Rare, on Blidingia minima . ( Gardner 3693 in UC ). On boat bottoms and other wood. Hollenberg and Abbott 1966, p. 9 [ 619 ]. Silva 1979, p. 339.
						Ster