Colus pusillus, known from Australia, is quite similar in appearance to Colus hirudinosus, and it has not been definitively established whether there is one variable species or several species with minor morphological differences.

Clathrus ruber is another stinkhorn featuring a clathrate structure, but unlike Colus hirudinosus, C. ruber has larger lattice mesh holes, and the lattice extends all the way to the base of the fruiting structure.
Colus pusillus, known from Australia, is quite similar in appearance to Colus hirudinosus, and it has not been definitively established whether there is one variable species or several species with minor morphological differences.
Clathrus ruber is another stinkhorn featuring a clathrate structure, but unlike Colus hirudinosus, C. ruber has larger lattice mesh holes, and the lattice extends all the way to the base of the fruiting structure.
Colus hirudinosus