What are trichomes? The biology behind cannabis resin

A small structure with specialised cells

Trichomes are outgrowths on a plant’s surface. Cannabis has glandular forms commonly described as bulbous, sessile and stalked. Glandular trichomes contain specialised cells associated with cannabinoid and terpene production. Not every hair-like structure should be treated as the same type of gland. [1]

What the microscopy research found

Livingston and colleagues examined trichome structure and chemistry during flower maturation. Their 2020 study connected changes in gland morphology with differences in metabolite content and found evidence that stalked glands develop from sessile-like precursors. The result supports a more nuanced view than a single, unchanging “resin crystal.” [1]

A later cell-wall study investigated the extracellular cavity where specialised metabolites accumulate. Secretory cells and the surrounding storage space have distinct roles: the gland is an organised biological structure, not simply a droplet sitting on a leaf. [2]

What a photograph can and cannot show

A labelled micrograph can illustrate shape, position and visible structures. Chemical identification needs a different kind of evidence. When reading an image caption, check whether the author measured the feature or merely described its appearance.

For a useful research caption, ask for the imaging method, a scale bar, the sampled tissue and the source of the image. Without a scale bar, an enlarged photograph cannot reliably communicate physical size. Without chemical measurements, it cannot establish a cannabinoid profile.

Keep biology separate from grading

Our editorial approach is to describe observable features first and reserve composition claims for appropriate analysis. A biological term such as “glandular” should not silently become a claim about a finished material’s purity. The micron guide explains a related distinction: length measurements and quality assessments answer different questions.