Fruit drupe attached to the receptacle. In some bramble fruits (such as blackberry) the receptacle is elongated and part of the ripe fruit, making the blackberry an "aggregate-accessory" fruit. The strawberry is also an aggregate-accessory fruit, only one in which the seeds are contained in achenes. In all these examples, the fruit develops from a single flower with numerous pistils. A multiple fruit is one formed from a cluster of flowers (called an "inflorescence"). Each flower produces a fruit, but these mature into a single mass. Examples are the pineapple, fig, mulberry, osage-orange, and breadfruit. In the photograph on the right,
Boletellus ananas named by Moses Ashley Curtis as "Boletus ananas" in 1848, based on specimens he found near the Santee River, in South Carolina. In 1909, William Murrill described the new genus "Boletellus" and made "Boletellus ananas" the type species. According to Murrill, the taxon "Boletus isabellinus", described by Charles Horton Peck in 1897 from specimens collected in Ocean Springs, Mississippi, is a synonym of "B. ananas"; Peck described this species from undeveloped specimens. Wally Snell later doubted Murrill's conclusion in a 1933 publication; he considered the differences in the spore structure too great to consider the species conspecific with "B. ananas",