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:
Although widely considered a synonym for rap music, the term hip-hop refers to a complex culture comprising four elements: deejaying, or âturntablingâ; rapping, also known as âMCingâ or ârhymingâ; graffiti painting, also known as âgrafâ or âwritingâ; and âB-boying,â which encompasses hip-hop dance, style, and attitude, along with the sort of virile ...