The order was circumscribed in 2010 to contain mostly resupinate (crust-like) forms that have been referred to genera Anomoporia, Amyloathelia, Amylocorticiellum, Amylocorticium, Amyloxenasma, Anomoloma, Athelopsis, Ceraceomyces, Hypochniciellum, Leptosporomyces and Serpulomyces and the anomalous species, Athelia rolfsii, now classified in its own genus, Agroathelia.

Anomoloma Hypnochniciellum molle Plicaturopsis Irpicodon Ceraceomyces Amyloxenasma Atheliopsis lacerata Amylocorticium Podoserpula pusio Amylocorticiellum Anomoporia kamtschatica Amyloathelia crassiuscula Anomoporia Serpulomyces Leptosporomyces septentrionalis The order contains one of three assemblages of basal lineages of Agaricomycetidae that contain corticioid fungi; the others are the Jaapiales and the Atheliales.

They have smooth hymenophores that can be either merulioid (wrinkled with low, uneven ridges), irpicoid (with "teeth") or poroid (with pores).

The basidia (spore-bearing cells) are mostly terminal but in one genus borne laterally on horizontal hyphae (pleurobasidia), invariably producing four spores.

Taxa that do not exhibit amyloid reactions include Agroathelia, Ceraceomyces, Podoserpula, Serpulomyces and Leptosporomyces septentrionalis.