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:
Difference Between Hip hop and Rap. Hip hop is a musical genre that is based on rhythm and a vocal style that is called rap. The performance is accompanied by pronounced beats. A hip hop performance therefore, may or may not include a rap song while a rap song may be performed without the hip hop dance and music. Rap is just the vocal part of an entire hip hop performance.