Caption:
Marchantia, a liverwort, showing male receptacle with antheridia. Light micrograph of a vertical section of thallus through a gemma cup containing gemma. The thallose or leafy plant is a gametophyte. It bears sex organs (male antheridia, female archegonia) on the underside or on special erect branches seta and capsule constitute the sporophyte which grows attached to the gametophyte.