Fig. 2

The different trichome types on Cannabis bract tissues observed in this study. All images are obtained from strain MD, lower bract surface, at 3 and 6 weeks of inflorescence development. a A stalked capitate trichome in the foreground (arrow) compared with small bulbous trichomes in the background. b, c Bulbous trichomes formed on short pedicels. d Nonglandular trichomes (ha) formed next to a bulbous (bu) and a sessile-capitate trichome (sc). In the background, abundant stomata (st) can be seen on raised epidermal cells. e Nonglandular hairs (ha) interspersed with sessile-capitate trichomes on a young bract. f Magnified view of a sessile-capitate trichome with fully formed head surrounded by a cuticle. g Presecretory sessile-capitate (arrow) and mature stalked-capitate trichomes with fully formed heads adjacent to one another. h Mature stalked-capitate trichomes formed in large numbers. Note the presence of small bulbous trichomes (arrow) and nonglandular trichomes in the background. i Magnified view of the head of a stalked-capitate trichome with fully formed cuticle surrounding the head