Colour of the Epidermis

It is quite difficult to indicate the colour of the epidermis objectively, because it may depend on the conditions of cultivation or growing conditions, and also on the vegetative stage of the plant. Another criterion describes whether the surface is shiny or dull.

Fig. 1. Formation of groups. Left solitary plant, middle groups, right clusters
Fig. 3. Body forms. Left clavate/obovoid, middle cylindrical, right columnar
Fig. 4. Apex forms. Left rounded, middle flattened, right depressed
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