Siphons or nutritive appendages, from which the order takes its.
An apparent, but not real, exception is Halecium halecinum, in which the blastostyle is produced from the side of a nutritive polyp, and both are enclosed in a common theca without a partition between them (Allman  p. 50, fig.
A bitter principle to which the name of quercin has been applied by Gerber, its discoverer, has also been detected in the acorn of the common oak; the nutritive portion seems chiefly a form of starch.
A cormidium may contain a single nutritive siphon (" monogastric ") or several siphons (" polygastric ").
- Diagram of Tubularia entiated into nutritive and indivisa.