unknown plant - Is this a plant?

unknown plant - Is this a plant?

Observation - unknown plant - Is this a plant? - Southern Africa. Description: The circular head of the plant was about 2.5 cm diameter, distinctly speckled, with a hollow centre into which projected spikes. The surrounding bracts were paper-like. It was situated on a rock face

The circular head of the plant was about 2.5 cm diameter, distinctly speckled, with a "hollow" centre into which projected "spikes". The surrounding bracts were paper-like. It was situated on a rock face. There appears to be an unopened specimen to the immediate left.