New observations on the basidiome ontogeny of Chamonixia caespitosa (sequestrate Boletaceae)

The description of basidiome development of Chamonixia caespitosa made by Eduard Fischer during the first quarter of the last century is extended, based on a new investigation of the original permanent mounts. This puffball-like fungus is exocarpic, claustropileate and amphicleistoblemate. A hymeniform palisade on the primordial stipe becomes partly covered and obliterated by the pileus margin and an amphicleistoblema. The morphological data confirm the molecular-taxonomic position of Chamonixia in the Boletaceae.