The sterile, tubelike tissue that surrounds the female reproductive structure in a leafy liverwort
Archegonia are surrounded early in their development by the juvenile perianth, through the slender beak of which the elongated neck of the fertilized archegonium protrudes.
The outer unit enclosing the flower, made up of an outer calyx and inner corolla, or either calyx or corolla, or both combined and undifferentiated from one another