[2] Pileus 1.2 to 6.2 cm diameter, at first slightly convex with down turned edge, then sometimes expanded and upturned, often depressed over the attachment of the stem, wavy, irregular and more or less lobed at the margin, when found growing usually whitish to dingy whitish or pale buffy white (Cartridge Buff, XXX.)

Stem short, 1.2 to 2.5 cm, central to excentric or occasionally almost lateral from the position in which it may have grown, similarly often bent, slender or rather stout, equal or slightly attenuated downwards, pruinose, tough, hollow above, the colour of the pileus.

[3] In New Zealand recorded on dead and decaying tree fern fronds, and fibrous monocotyledon leaf and stem material.

As Cliyocybe semiocculta the pale colouration of the pileus, the adnate to slightly decurrent gills, the presence of clamp connections and the absence of cystidia indicate it belongs in Subgenus Clitocybe, Section Disciformes.

[7] Molecular genetics analysis suggests that Ossicaulis is most closely related to the genera Asterophora, Hypsizygus, Lyophyllum, and Tricholomella.