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Bark Exudates

Resins = lipid-soluble mixtures of volatile and non-volatile terpenoid and phenolic secondary compounds.

Gums and Mucilages = water soluble but high molecular weight polysaccharides. The two classes of compounds are similar but gums are only found in cavities (e.g., Acacia, Prosopis, Eucalyptus, Pterocarpus) whereas mucilages are found in a diversity of structures including trichomes, canals, and secretory cells.

Latex = lipid-soluble often milky white emulsions with a diversity of substances in solution or in suspension that can include terpenoids, phenolic compounds, proteins, alkaloids, minerals, and carbohydrates. Latex is found in specialized tubes called laticifers that often ramify through the pith, foliar mesophyll, and especially in vascular tissues including phloem and xylem rays. In some species the laticifers form a network just external to the phloem with branches into the cortex (Langenheim, 2003).

Reference

Langenheim JH  (2003)  Plant Resins: Chemistry, Evolution, Ecology and Ethnobotany. Timber Press, Portland, Oregon, 586 pages
 

The photograph at the top of the page shows white latex oozing out of a rubber tree.  This latex is the raw material used to produce natural rubber.

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