There are currently three kinds of trichomes that we know about: bulbous, sessile, and stalked. The researchers utilized microscopic processes and chemical filing techniques to learn about these trichomes as well as their internal structures. They found that all these three kinds emit various colors when exposed to UV light. “We saw that stalked glandular trichomes have expanded ‘cellular factories’ to make  more cannabinoids and fragrant terpenes,” says study lead author Sam Livingston. “We also found that they grow from sessile-like precursors and undergo a dramatic shift during development that can be visualized using new microscopy tools.”