Aspergillus nidulans. Cleistothecium (sexual spore container) surrounded by Hülle cells in Aspergillus nidulans. Hülle cells help the formation of a spore container.

Aspergillus nidulans. Cleistothecium (sexual spore container) surrounded by Hülle cells in Aspergillus nidulans. Hülle cells help the formation of a spore container.
Images of cells produced by Aspergillus species as seen by scanning electron microscopy.