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:
punk(Noun) A male used for sex by larger or stronger inmates, a pussyboy. punk(Noun) A social and musical movement rooted in rebelling against the established order. punk(Noun) The music of the punk movement, known for short songs with electric guitars, strong drums, and a direct, unproduced approach.