Capitate Glandular Trichomes

Capitate glandular trichomes are specialized resin-producing structures found on cannabis flowers and leaves, characterized by a distinct mushroom-like morphology with a large, bulbous head seated on a multicellular stalk. These structures contain cannabinoid and terpene-rich secretory cells in their enlarged heads, making them a primary site of secondary metabolite accumulation. The term 'capitate' refers to the head-like appearance under magnification, distinguishing them from smaller, non-glandular trichomes that lack cannabinoid production. Capitate-stalked and capitate-sessile variants exist, with differing stalk lengths affecting resin visibility and harvestability. Their density and distribution across the plant surface are heritable traits commonly selected for in breeding programs targeting resin yield.

Breeders frequently assess capitate trichome density and morphology as a breeding marker for cannabinoid and terpene production potential. Dense capitate trichome coverage is often incorporated into selection criteria for lines intended for concentrate extraction and resin-focused cultivars.