The pistil consists of a single carpel with its ovary, style, stigma and solitary ovule or twin ovules.
Pollen may be transferred to the stigma of the same flower - self-pollination (or autogamy), or to the stigma of another flower on the same plant or another plant of the same species - crosspollination (or allogamy).
Stg, Stigma or orifice of the hollow tendons of the branchial plates of Limulus.
S, Prosomatic stigma or aperture of the tracheal system.
Prosoma and opisthosoma; a, tracheal stigma; b, last somite.