Atractocolax Hyalopycnis Krieglsteinera Pycnopulvinus Slooffia Krieglsteineraceae Pouzar (1987)[1] The Heterogastridiales are an order of fungi in the class Microbotryomycetes.

The order contains a single family, the Heterogastridiaceae,[2] which currently contains five genera.

[4] Those producing hyphal states have auricularioid (laterally septate) basidia and are parasitic on other fungi.

Basidiocarps (fruit bodies), when present, are minute and variously stilboid (pin-shaped),[5] pustular,[6] or pycnidioid (flask-shaped).

[2] Molecular research, based on cladistic analysis of DNA sequences, has shown that the order is a monophyletic (natural) group, though the type and only species of Krieglsteinera[1] has not yet been sequenced and may belong elsewhere.