This feature relates to the overall shape of caulocystidia, in side view, irrespective of the shape of the apex (Caulocystidia apex shape) and any branching (Caulocystidia branched). The different shape states are simply based on where the widest point is, and the length/width ratio.

If the shape is described with modifiers such as 'narrowly' clavate or 'broadly' clavate, choose the state being modified (in this example, clavate). However, if the shape is described as 'slightly' clavate or 'subclavate', chose the state that otherwise matches (which will usually be cylindrical).

More than one shape can be present.

Choose this state if: the widest point is towards the apex. The cystidia are club-shaped. Another term for this shape is pyriform.