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:
At one point in time a rap was a set of excuses a con artist handed you in an effort to deceive you. In the 70s a rap were the words a person used when trying to persuade you. This particularly applied to the persuavive efforts of a young man trying to obtain sexual favors from a female.