The fronds of tree ferns are usually very large and multiple-pinnated, but at least one type has entire (undivided) fronds. The fronds of tree ferns also exhibit circinate vernation, meaning the young fronds emerge in coils that uncurl as they grow.he order Cyatheales, which includes the tree ferns, is a taxonomic division of the fern class, Polypodiopsida.
rap noun (MUSIC) A2 [ U ] a type of popular music with a strong rhythm in which the words are spoken, not sung:
From Wikipedia, the free encyclopedia. Rap rock is a music genre that fuses vocal and instrumental elements of hip hop with various forms of rock. Rap rock's most popular subgenres include rap metal and rapcore, which include heavy metal and hardcore punk-oriented influences, respectively. One of the earliest examples would be . The Magnificent Seven  by The Clash, which fused new wave, hip hop, and funk.