monosiphonousadj.
/ˌmɒnə(ʊ)ˈsʌɪfənəs/, /ˌmɒnə(ʊ)ˈsʌɪfn̩əs/, U.S. /ˌmɑnəˈsaɪfənəs/ Botany.
1. Of an algal stem or filament: composed of a single strand of large elongated cells. Of an alga: having filaments of this kind.
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the world > plants > particular plants > algae > seaweed > [adjective] > of or belonging to type of seaweed
monosiphonous1853
rhodospermous1856
tetrasporic1857
tetrasporous1874
fucaceous1891
monosiphonic1899
laminaria1935
lithothamnion1935
lithothamnic1967
1853 W. H. Harvey Nereis Boreali-Americana ii. 141 in Smithsonian Contrib. Knowl. 5 Wrangeliaceæ... Seaweeds, furnished with a monosiphonous, articulated axis.
1888 Encycl. Brit. XXIV. 126/2 The filaments may consist of single rows of cells (monosiphonous), as in most Ectocarpeæ, or of several rows of cells (polysiphonous), as in the Mesoglæaceæ.
1937 J. E. Tilden Algae & their Life Relations (ed. 2) vi. 224 Plants usually monosiphonous, branched, resembling the Ectocarpales.
1987 R. L. Fletcher Seaweeds Brit. Isles III. i. 261 All branches terminated by a fringe of hair-like, monosiphonous, unbranched, photosynthetic filaments.
2. Of a pollen grain: producing a single pollen tube during germination. Of a pollen tube: single.
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1961 New Phytologist 60 301 Usually on germination each pollen-grain gives out a single tube (monosiphonous).
1988 Bull. Torrey Bot. Club 115 110/2 Monosiphonous, porogamous pollen tubes were observed.
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022).
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adj.1853