Interesting Fact: Interestingly the leaf pattern of this plant resemble fish skeleton. Fish bone Cactus is an epiphytic cactus with smooth green skin and extensively branched stems. The primary stems are often woody. The lobes are rectangular or slightly rounded.The white or pale yellow flowers bloom nocturnally, exuding a strong, sweet scent. The fruit is thick, ovoid and brownish, greenish or yellowish in color.