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DECEW'S GUIDE

Sphaerotrichia divaricata ( C. Agardh ) Kylin
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Synonyms: Chordaria dissessa Setchell et Gardner, Sphaerotrichia dissessa ( Setchell et Gardner ) A. Zinova Illustrations: Sporophyte: Setchell and Gardner 1925, pl. 41, fig. 57 ( x-section, unilocular organs ), pl. 75, ( photo: habit ); Peters et al. 1987, p. 462, figs. 1 ( photo: habit ), fig. 2 ( photo: section, unilocular sporangia ). Gametophytes: Peters et al. 1987, p. 460, figs. 5, 6 ( photos: gametangia ), p. 462, figs. 7 & ndash; 12 ( photos: sexual reproduction ) Pacific Coast Distribution: Bamfield Inlet and Grappler Inlet, Vancouver I. British Columbia ( Peters et al. 1987, p. 458 ); Washington ( Seal Rock, Hood Canal, Mason Co.: R. Norris and Wynne 1969, p. 137; Orcas I.: Setchell and Gardner 1925, p. 574 ) Taxonomy: Zinova 1958 Life History: Field plants with unilocular organs released zooids which grew into microscopic thalli. These plants developed in two ways: 1 ) dioecious gametophytes, which released gametes which fused and produced plants similar to field plants, or 2 ) plants which recycled directly without sex. At higher temperatures or short days all microthalli recycled directly via zooids ( Novaczek and McLachlan 1987; Peters et al. 1987; Peters and M & uuml; ller 1986 a; Ajisaka and Umezaki 1978 ) Chromosomes: Peters et al. 1987

							J	F	M	A	M	J	J	A	S	O	N	D
BRITISH COLUMBIA						Pl													Rare, on Zostera , and on sandy substrate subtidal 30 & ndash; 40 ft. Setchell and Gardner 1925, p. 574. Scagel 1957, p. 79. R. Norris and Wynne 1969, p. 137. Peters and M & uuml; ller 1986 a, p. 69.
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COLUMBIA RIVER						Pl
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CAPE ARAGO						Pl
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CAPE MENDOCINO						Pl
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POINT ARENA						Pl
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SAN FRANCISCO						Pl
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