hydrorhiza

[ hahy-druh-rahy-zuh ]

Phonetic (Standard)IPA

noun

, plural hy·dro·rhi·zae [hahy-dr, uh, -, rahy, -zee].

the rootlike base of a hydroid colony, by which it is attached to the substratum.

From New Latin, dating back to 1860–65; hydro- ¹, -rhiza

The colonies are cylindrical tubes about one quarter of an inch in height, rising from a creeping stem (hydrorhiza).

In some cases, however, medusa-buds are formed on the hydrorhiza, as in Hydrocorallines.

The foot by which it is attached often sends out root-like processes—the hydrorhiza (c).

As a general rule polyp-buds are produced from the hydrorhiza and hydrocaulus, while medusa-buds are formed on the hydranth.

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