... induce regression. Stolon regression may thus be a factor contributing to natural variation between runners and sheets. * Author for correspondence ( [email protected] ) 2 7 2011 © 2011. 2011 cell death clonal organism cnidarian stress response evolutionary morphology hydroid...

... appearance. P, perisarc; E, ectoderm; MG,mesoglea; N, nucleus; M, mitochondrion; V, vacuole. Scale bars, 1 μm. As with many clonal organisms, colonial hydroids exhibit variation in growth form ranging from runner-like (widely spaced polyps and stolon branches) to sheet-like (closely spaced polyps...