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BRITISH COLUMBIA
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Common, in the upper intertidal forming a dense, green carpet on rocks and old wood. Scagel 1957, pp. 36, 37. Scagel 1966, p. 43. Hawkes et al. 1979, p. 88. Garbary et al. 1985, p. 43.
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COLUMBIA RIVER
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Common, in the upper intertidal, in protected localities and on high surf-swept rocks and mussel shells throughout Oregon. Doty 1947, p. 17. Sanborn and Doty 1947, p. 24. Markham and Celestino 1977, p. 257.
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CAPE ARAGO
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Common, on rocks at high tide levels subject to freshwater influence, also on surf swept rocks. Dawson 1965a, p. 7.
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CAPE MENDOCINO
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Common, on rocks and pilings, in exposed habitats. Kjeldsen 1995, p. 2.
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POINT ARENA
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Abundant, on rocks and pilings of the upper and mid intertidal in sheltered to exposed habitats. Johansen 1966a, p. 85. Kjeldsen 1995, p. 2.
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SAN FRANCISCO
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Common, in the high intertidal splash zone as green strands, forming a belt on vertical faces of rocks and old wood. Smith 1944, pp. 50, 51. J. Norris 1971, p. 146. Silva 1979, p. 340.
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