How many species of Araucarioxylon?

Fossil wood, similar to that of modern Araucariaceae, has been known for a long time, and is usually called Araucarioxylon. More than 400 morphospecies have been described, whereas this wood type displays few characteristic features. This taxonomical profusion is compounded by nomenclatural problems, Araucarioxylon being an illegitimate name. The status of the wood morphogenus, the infrageneric structure and the names that apply to the taxa designated for fossil woods of the Araucarioxylon-type are discussed. A database with 428 morphospecies designated for Araucarioxylon-type of wood is analyzed. The name Agathoxylon Hartig seems to be the most appropriate for the corresponding morphogenus. Albeit theoretically several hundred morphospecies could be recognized within this group, it is at least as probable that only one should be retained.