"In the form" and "of the form" - both phrases indicate a similarity or resemblance to something else, but the former refers to the physical appearance or shape, while the latter refers to the overall characteristics or nature. "In the form of something" means that something is presented or expressed in a particular way or shape. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.