Calliergonella is a genus of mosses in the class Bryopsida, order Hypnales. It was first described in 1911 by the German bryologist Leopold Loeske, who published the genus in the journal Hedwigia. GBIF's taxonomic backbone places Calliergonella in the family Pylaisiaceae, a placement Wikipedia agrees with, though other checklists aggregated by GBIF list the same genus under Hypnaceae — a reminder that family-level boundaries among pleurocarpous mosses have been revised repeatedly and are not fully settled across sources.
The genus has a cosmopolitan distribution, occurring across many regions worldwide. GBIF's backbone records six descendant names under Calliergonella, encompassing both accepted species and synonyms, though only a small number of species are commonly recognized — most notably Calliergonella cuspidata and Calliergonella lindbergii. Calliergonella cuspidata is the best-known and most widely distributed member of the genus. It has also served as a subject in applied bryology: a study on the effects of the herbicide asulam on moss growth found that C. cuspidata showed intermediate sensitivity to asulam exposure compared with other mosses tested, indicating the species' occasional use as a bioindicator in vegetation-management research.
Distribution
Calliergonella has a cosmopolitan distribution. Its most widespread species, Calliergonella cuspidata, occurs widely around the world.
Taxonomy Notes
The genus was described by Leopold Loeske in 1911, published in Hedwigia 50(5–6): 210–248. GBIF's accepted backbone record places it in family Pylaisiaceae, order Hypnales, class Bryopsida — but other checklists indexed by GBIF place the same genus in family Hypnaceae, so family placement should be treated as unsettled rather than fixed.
