This is a monotypic genus. Information on the genus can be found below.
* Udagawa, S, and S. Ueda. 1988. Calceomyces, a new genus of the Xylariaceae with shoe-shaped ascospores. Mycotaxon 32: 447-455.

This genus has the following characteristics:

stromatal tissue quantity: lacking entirely
subiculum: absent
substrates: associated with substrates other than dung or insect nests
ascomatal ostioles: present
ascomatal configurations: not valsoid
ascomatal surface: glabrous
ascomatal orientation: mostly oriented vertically
ascal apical rings: present
ascospore cell number: one-celled
ascospore shapes: other than cuboid
ascospore color: colored
ascospore ornamentation: pitted
ascospore germination site morphology: slit-like
perispore dehiscence: indehiscent
anamorphs: Nodulisporium-like