Cystostereaceae is not widely recognized as an established taxonomic group in the current scientific literature. Reliable encyclopedic sources, such as major mycological references or taxonomic databases, do not provide a definitive entry for a family bearing this name. Consequently, detailed information on its composition, diagnostic characteristics, phylogenetic placement, or historical usage is unavailable.
Possible etymology
The name appears to be constructed from Greek roots: cyst‑ meaning “bladder” or “sac” and -stere‑ (from stereos) meaning “solid” or “firm.” Such a formation is typical in mycological nomenclature, where it often describes morphological features of the fungi (e.g., a solid, bladder‑like fruiting body).
Plausible contextual usage
In occasional mycological publications, similar names have been proposed for families containing corticioid or crust‑forming fungi, sometimes related to the genus Cystostereum or Cystostereum. However, without corroborating taxonomic treatment in recognized databases (e.g., Index Fungorum, MycoBank, or the Catalogue of Life), the status of Cystostereaceae remains uncertain.
Conclusion
Given the lack of verifiable, peer‑reviewed sources, Cystostereaceae cannot be described with confidence as a distinct, accepted family. Further taxonomic research or authoritative publication would be required to establish its validity.