- the rootlike base of a hydroid colony, by which it is attached to the substratum.
Origin of hydrorhiza
Examples from the Web for hydrorhiza
Historical Examples of hydrorhiza
The colonies are cylindrical tubes about one quarter of an inch in height, rising from a creeping stem (hydrorhiza).The Sea-beach at Ebb-tide
Augusta Foote Arnold
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.