lehtede mesofüllis sammaskoe all paiknev ebaregulaarse kuju ja suurte rakuvaheruumidega ümbritsetud fotosünteesivatest rakkudest koosnev kude, It is part of the mesophyll, where it forms a layer next to the palisade cells in the leaf. The spongy mesophyll's function is to allow for the interchange of gases (CO₂) that are needed for photosynthesis.