Mushroom-like fruiting bodies with teeth rather than gills on underside, stalk often somewhat eccentric.

Ectomycorrhizal under Nothofagus and tea-tree.

Several subspecies have been described for H. crocidens which appear to be specialised with respect to substrate. Under tea-tree hosts are Hydnum crocidens var. badium (with a dark brown cap) and Hydnum crocidens var. crocidens (with a dirty-whitish cap with irregular reddish or rusty-brown patches). Under Nothofagus is Hydnum crocidens var. wellingtonii, similar in appearance to Hydnum crocidens var. crocidens, but with slightly larger spores.

Mushroom-like fruiting bodies with teeth rather than gills, stipe often somewhat eccentric. Ectomycorrhizal under beech and tea-tree, some specialisation amongst the H. crocidens subspecific taxa with respect to substrate.

Six species have been reported from New Zealand, only those listed below have descriptions or images available from NZFungi.