Fruit anatomy Fruit anatomy Fruit anatomy is the plant anatomy of the internal structure of fruit. Fruits are the mature ovary or ovaries of one or more flowers. In fleshy fruits, the outer layer (which is often edible) is the "pericarp", which is the tissue that develops from the ovary wall of the flower and surrounds the seeds. But in some seemingly pericarp fruits, the edible portion is not derived from the ovary. For example, in the fruit of the ackee tree the edible portion is an aril, and in the pineapple several tissues from the flower and stem are involved. The
Boletellus ananas ananas" by smooth stem without a ring, different spores, and flesh that is less tough. The Australian species "Boletellus ananiceps" has spores with narrow longitudinal ribs that do not have cross-striae. "B. dissiliens" has colors that are not red as in "B. ananas", and pores that can become reddish in maturity. Further, the cap flesh of "B. dissiliens" turns blue upon exposure to air. The fruit bodies of "B. ananas" typically grow scattered or in groups under oak and pine trees, often on their bases. In Guyana, the mushroom typically fruits singly or in pairs within above ground level on