hydrorhiza


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Related to hydrorhiza: Hydrocaulus, perisarc

hydrorhiza

[‚hī·drō′rī·zə]
(invertebrate zoology)
Rootlike structure of a hydroid colony.
References in periodicals archive ?
Description: Colonies pale yellow to golden, particularly stolonal, arising from a creeping hydrorhiza. Tall hydrothecal pedicels, arising at close intervals.
Description: Whitish or pale yellowish stolonal colonies, up to 4 mm high; creeping hydrorhiza. Pedicels very long, about 18-20 mm, thick perisarc, with 3-4 occasional groups of annuli irregularly placed along length; groups with 3-7 annuli; distal end of pedicel with slight swelling just beneath a sub-hydrothecal spherule.
Stolonal forms, up to 6 mm high, arising from a creeping hydrorhiza; erect forms branching sympodially up to 13 mm high, but usually 10 mm.
Description: Whitish or sometimes yellowish stolonal colonies, up to 5 mm high, arising from a creeping hydrorhiza. Delicate pedicels, 0.8-5.0 mm high, 35-50 [micron]m in diameter, with a group of 22-25 basally placed annuli, and 6-8 annuli at distal end.