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Ulothrix implexa (Kützing) Kützing
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Synonyms:
Ulothrix acrorhiza Kornmann, U. subflaccida Wille
Illustrations:
Lokhorst 1979, p. 279, fig. 15: a–c (vegetative filaments with cellular detail), d (filament with zoosporangia), e (filament with germinating aplanospores), p. 280, fig. 16: a (zoospores), b (germination of zoospores), c (basal portion of mature filament), e (filament with akinetes), f (filament with gametangia), g (gametes and zygotes), p. 281, fig. 17: a (germination of zygotes), b, c (sporophytes), d–f (sporogenesis), g (zoospores from sporophyte); Scagel 1966, pl. 16, figs. I, J (vegetative filaments with cellular detail); Setchell and Gardner 1920b, pl. 9, fig. 6: A, B (vegetative filaments with cellular detail), C (zoosporangia); Smith 1944, pl. 1, fig. 4 (vegetative filament with cellular detail), fig. 5 (zoosporangial discharge pores) Display references
Pacific Coast Distribution:
Alaska (Iliuliuk, Unalaska I., Aleutian Is. and Orca, Prince William Sound: Setchell and Gardner 1903, p. 217); Washington (Orcas I., San Juan Is.: Scagel 1957, p. 33; Seattle: Thom et al. 1977, p. 270); Hug Pt., Clatsop Co., Ore. (Markham and Celestino 1977, p. 257); Bodega Head, Sonoma Co., Calif. (Johansen 1966a, p. 84); San Francisco, Calif. (Setchell and Gardner 1920b, p. 283); Monterey, Calif. (Smith 1944, p. 34); Redondo Beach, Los Angeles Co., Calif. (Hollenberg 1971b, p. 281) Display references
Taxonomy:
Burrows 1991, p. 52; Lokhorst 1979, p. 230 Display references
Life History:
uninvestigated in Pacific coast populations; in Europe and Japan, unisexual gametophytic filaments alternating 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 common (Lokhorst 1979; Ohgai and Fujiyama 1976; Ohgai et al., 1975; Kornmann 1964); in one strain (U. acrorhiza), filaments recycling by means of quadriflagellate zoospores, sexual reproduction lacking (Kornmann 1964) Display references
Biology/Ecology:
Lokhorst 1979, p. 241 Display references
Ultrastructure:
Lokhorst 1979, p. 238 Display references
 
J F M A M J J A S O N D
BRITISH
COLUMBIA 		Repr                         Uncommon, on upper intertidal rocks and wood, usually near the mouths of streams. Scagel 1957, p. 33. Scagel 1966, p. 28. Display references
Ster        xx            
                       
COLUMBIA
RIVER 		Repr                         Uncommon, in the upper intertidal, on well worn rocks that are otherwise bare, and rocks around and protruding from pools. Doty 1947, p. 5. Markham and Celestino 1977, p. 257. Display references
Ster      x                
                       
CAPE
ARAGO 		Repr      x                
Ster xxx  xx            
                       
CAPE
MENDOCINO 		Repr                        
Ster                        
                       
POINT
ARENA 		Repr                         Uncommon, on upper intertidal rocks and wood, usually near the mouths of streams in exposed habitats. Johansen 1966a, p. 84. Display references
Ster    x                  
                       
SAN
FRANCISCO 		Repr                         Uncommon, on boat bottoms and other wood. Smith 1944, p. 34. Silva 1979, p. 339. Display references
Ster        x              
                       
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Page dated: Mon Feb 13 21:24:48 2006
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