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Parenchyma
Parenchyma () is the bulk of functional substance in an animal organ or structure such as a tumour. In zoology it is the name for the tissue that fills the interior of flatworms.
Wikipedia
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Stroma (noun)
The tissue structure of an organ, etc., that serves to support it.
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Parenchyma (noun)
The functional connective and supporting tissue.
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Parenchyma (noun)
The cellular tissue, typically soft and succulent, found chiefly in the softer parts of leaves, pulp of fruits, bark and pith of stems, etc.
Wiktionary