更多perisarc例句

1. It flattens itself out into a disc-like form, becomes divided into four lobes, and covered by a cuticle (perisarc).
2. Over the whole exterior a delicate pellicle—the future perisarc—now becomes secreted.
3. The stem may contain a single coenosarcal tube (“monosiphonic”) or several united in a common perisarc (“polysiphonic”).
4. The genera are based upon these differences in the perisarc.