different between sporosac vs perigonium

English

sporo- +? sac

sporosac (plural sporosacs)

(botany) A hydrozoan reproductive zooid or simple form of gonophore which does not become medusoid in form or structure
(zoology) An early or simple larval stage of trematode worms and some other invertebrates, which is capable of reproducing other germ cells by asexual generation; a redia.

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

perigonium (plural perigonia)

(botany) The sterile parts of a flower; collectively, the sepals and petals (or tepals); the perianth.
Synonyms: perianth, perigone
(botany) The modified leaves around the antheridia in a bryophytic plant.
(dated, zoology) The wall of the sporosac in a hydroid.

Send