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 following an extended period of rain and high humidity. Some varieties of "B. ananas" from southeastern North America, Costa Rica, Brazil, Panama, Nicaragua, and Guyana have been noted to fruit on tree trunks, although terrestrial fruiting has been reported in Malaysia and Central America. Due to the typically elevated fruiting habit and occurrence on dead wood, the ectomycorrhizal status of "B. ananas" has been debated; in the protolog Murrill noted "it always occurs either as a wound parasite on pine trunks or about the base of living pine trees." All collections have been made in association with ectotrophic host trees