Secretory gland from winter marjoram

Secretory gland from winter marjoram

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Caption: Light micrograph of a sessile secretory gland on the herb winter marjoram, Origanum heracleoticum. There are two basic types of secretory glands (or trichomes); stalked and unstalked (or sessile). A number of variations of structure exist but generally between 4 and 12 specialised cells form a small cushion over which a membrane develops. Each cell produces and secretes a cocktail of oils which accumulate beneath the membrane causing it to swell. Plants usually secrete extrafloral substances as a defence against bacteria, fungi or predators. Floral secretions attract insects for pollination purposes. Magnification: x400 at 35mm size.

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Keywords: botany, herb, leaf, leaves, marjoram, nature, origanum heracleoticum, plant, plants, secretory gland, secretory gland on herb, trichome

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