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:
Rap is a way of talking. A rap poem: 1) Has a strong RHYTHM 2) Uses RHYME 3) Has a THEME which is either a story or a message. 4) Often has the word âRAPâ in the title. 5) Uses everyday, COLLOQUIAL language 6) Is often written in a DIALECT, such as a Caribbean dialect. brief history of RAP and RAP POETRY â¦ RAP has a long history â one that can be traced back to âTOASTINGâ in Jamaica (talking over reggae records) and before that to the poetry of âGRIOTSâ (musicians-storytellers) in Africa.