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Hecatonema streblonematoides ( Setchell et Gardner ) Loiseaux
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epiphytic habit Synonyms: Comsponema streblonematoides Setchell et Gardner, C. pusillum Setchell et Gardner, C. speciosum f. piliferum Setchell et Gardner, C. nummuloides Setchell et Gardner, C. myrionematoides Setchell et Gardner, C. secundum Setchell et Gardner, C. ramulosum Setchell et Gardner, C. secundum f. terminale Setchell et Gardner, Hecatonema variabile Setchell et Gardner, H. clavatum Setchell et Gardner Illustrations: Abbott and Hollenberg 1976, p. 163, fig. 130 ( plurilocular plant ); Loiseaux 1970 b, p. 252, figs. 2 a & ndash; d ( various plurilocular plants ), p. 254, fig. 3 ( cultured plants ); Setchell and Gardner 1922 b, pl. 35, fig. 4 ( plurilocular plant ), fig. 6 ( plurilocular plant ), pl. 36, fig. l ( plurilocular plant ), pl. 37, figs. 1, 2 ( plurilocular plant ), fig. 3 ( plurilocular plant ), fig. 4 ( plurilocular plant ), pl. 38, fig. 1 ( plurilocular plant ), fig. 2 ( unilocular plant ), pl. 39, figs. 1, 3, 4, 5 ( plurilocular plant ), pl. 41, figs. 1 & ndash; 12 ( plurilocular and unilocular plants ), pl. 40, figs. 1 & ndash; 3 ( plurilocular plant ) Pacific Coast Distribution: Alaska ( Loiseaux 1970 b, p. 253 ); Moclips, Wash. ( Setchell and Gardner 1922 b, p. 357 ); Crescent City, Del Norte Co ., Calif. ( Dawson 1965 a, p. 14 ) to Carmel Bay, Monterey Peninsula, Calif. ( Setchell and Gardner 1922 b, p. 356 ); Gulf of California ( Puerto Pe & ntilde; asco, Sonora, M & eacute; xico: Loiseaux 1970 b, p. 253 ) Taxonomy: Loiseaux 1970 b, p. 253 Life History and Biology: microscopic plants from nature with plurilocular organs bore zooids which did not fuse, but settled to grow into plants like their parents with plurilocular organs. Those kept at 15 C or 20 C failed to form unilocular organs, but those kept at 10 C or transferred from 15 C to 10 C produced unilocular organs Microscopic plants from nature with unilocular organs bore zoospores which did not fuse but settled and grew into microscopic branched filamentous systems of a Microsyphar stage with plurilocular organs. On rarer occasions a more robust plant was formed similar to Hecatonema forming unilocular and plurilocular organs as in nature. It would seem reasonable that these plants were formed from a fusion of a pair of zooids from the plurilocular organs of the Microsyphar stage ( Loiseaux 1970 b, p. 253 )

							J	F	M	A	M	J	J	A	S	O	N	D
BRITISH COLUMBIA						Pl													Uncommon, on stipes and pneumatocysts of Nereocystis and on Costaria, in pools and in the low intertidal and subtidal. Loiseaux 1970 b, p. 253. Hawkes et al. 1979, p. 93.
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COLUMBIA RIVER						Pl
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CAPE ARAGO						Pl													Uncommon, epiphyte on pneumatocysts of Nereocystis in pools and in the low intertidal and subtidal. Dawson 1965 a, p. 4.
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CAPE MENDOCINO						Pl
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POINT ARENA						Pl													Abundant, epiphyte on pneumatocysts of Nereocystis and on Costaria, in pools and in the low intertidal and subtidal. Loiseaux 1970 b, p. 253. Kjeldsen 1995, p. 22.
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SAN FRANCISCO						Pl													Uncommon, epiphyte on pneumatocysts of Nereocystis , in pools and in the low intertidal and subtidal. Smith 1944, p. 109.
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