CENTER FOR PHYCOLOGICAL DOCUMENTATION
DECEW'S GUIDE

Ectocarpus acutus Setchell et Gardner
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habit of plurilocular plant and chloroplast detail Note: Ectocarpus acutus is considered conspecific with E. fasciculatus by H. Kim and Lee ( 1992 a ) Synonyms: Ectocarpus acutus var. haplogloiae Doty Illustrations: Abbott and Hollenberg 1976, p. 125, fig. 83 ( plurilocular plant ); Doty 1947, pl. 8, fig. a ( epiphytic habit ); Saunders 1898, pl. 21, fig. 3, 4 ( plurilocular plants ); Setchell and Gardner 1922 d, pl. 48, fig. 36 ( habit ), fig. 37 ( plurilocular organ variation ), fig. 38 ( chloroplast morphology ), fig. 39 ( detail of branching ), pl. 49, fig. 41 ( plurilocular organs ) Pacific Coast Distribution: Bamfield, Vancouver I ., British Columbia ( Scagel 1973, p. 133 ) to Monterey Peninsula, Calif. ( Smith 1944, p. 81 ); Lion Rock, near Diablo Cove, San Luis Obispo Co ., Calif. ( Sparling 1977, p. 33 ); San Pedro, Los Angeles Co ., Calif. ( Abbott and Hollenberg 1976, p. 124 ) Life History: uninvestigated, but presumably alternation of isomorphic phases. Plants exclusively plurangial in the north may recycle directly. Unilocular organs seen for first time ( in UC ) Phenology: this annual species appears sooner in the south than the north Biology/Ecology: Devinny and Kirkwood 1974, p. 102 Ultrastructure: Bailey and Bisalputra 1969

							J	F	M	A	M	J	J	A	S	O	N	D
BRITISH COLUMBIA						Pl													Rare, epiphytic on Desmarestia and other large brown algae and Haplogloia in tidepools and low intertidal in fully sheltered habitats. Scagel 1957, p. 67. Scagel 1973, p. 133.
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COLUMBIA RIVER						Pl													Rare, epiphytic on kelps, Haplogloia , and Zostera , in tidepools and low intertidal. Doty 1947, pp. 31, 32. Sanborn and Doty 1947, p. 27.
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CAPE ARAGO						Pl													Rare, on Desmarestia , Laminaria , and Haplogloia throughout the tidal range and subtidal. Dawson 1965 a, p. 11.
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CAPE MENDOCINO						Pl													Rare, on Desmarestia and Laminaria , in pools, the low intertidal and subtidal. Kjeldsen 1995, p. 19.
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POINT ARENA						Pl													Rare, on Desmarestia , Egregia , and Laminaria in pools, the low intertidal and the subtidal. Kjeldsen 1995, p. 19.
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SAN FRANCISCO						Pl													Rare, epiphytic on the leaf tips of Desmarestia , especially D. ligulata [ as D. herbacea ], in feathery tufts to 7 cm. long, and on Haplogloia in the low intertidal; subtidal in Macrocystis beds. Smith 1944, p. 80. Devinny and Kirkwood 1974, p. 102. Silva 1979, p. 332.
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