Fruit anatomy rate of germinating seeds. 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
Boletellus ananas the trunks of the tropical tree "Dicymbe corymbosa" (subfamily Caesalpinioideae), associated with ectomycorrhizas within humic accumulations. It is rarely found fruiting on the ground on heavily decayed, root-penetrated wood. Rolf Singer suggested that the fungus was not mycorrhizal, noting that as well as occurring under or on the bases of both pine and oaks, it occurred in scanty humus and debris accumulated on rock walls. Singer concluded that the species prefers to grow on hard surfaces. Harry D. Thiers, in his study of the bolete flora of Texas, wrote that "B. ananas" was a rare species that often fruited abundantly