Callicladium haldaneanum(Grev.) H.A.Crum

callicladium moss

WFO wfo-0001186719 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 8 separate observations

Callicladium haldaneanum, photographed by Violet T.
fig. a Violet T., CC BY 4.0 / 2022-04-29 / obs. 199827981
Callicladium haldaneanum, photographed by Barry Cottam
fig. b Barry Cottam, CC BY 4.0 / obs. 191187588
Callicladium haldaneanum, photographed by Andrew Sebastian
fig. c Andrew Sebastian, CC BY 4.0 / obs. 190780828
Callicladium haldaneanum, photographed by Andrew Sebastian
fig. d Andrew Sebastian, CC BY 4.0 / obs. 187827713
Callicladium haldaneanum, photographed by Mila C.
fig. e Mila C., CC BY 4.0 / obs. 187401235
Callicladium haldaneanum, photographed by Violet T.
fig. f Violet T., CC BY 4.0 / obs. 180395522
Callicladium haldaneanum, photographed by Violet T.
fig. g Violet T., CC BY 4.0 / obs. 177579769
Callicladium haldaneanum, photographed by Zac Peterson
fig. h Zac Peterson, CC BY 4.0 / obs. 174050192

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

The specimen a real sheet, in a real collection

Herbarium
The New York Botanical Garden
Accession
779782
Filed as
Hypnum curvirostrum Brid.
Det. by
not recorded on this sheet
Collected
not recorded
Origin
US
The sheet
View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Where it actually grows measured, from 697 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -15.7 °C -9.9 °C -3.6 °C
Warmest month, mean daily high 21.1 °C 25.6 °C 28.7 °C
Annual rainfall 769 mm 1,060 mm 1,417 mm
Rainfall in the driest quarter 98 mm 212 mm 303 mm

It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 697 research-grade observations of Callicladium haldaneanum that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Also published as 26 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Brachythecium brevinerve Kindb.
  • Brachythecium weinmannii (Nees) Paris
  • Callicladium haldaneanum var. viride (S.Okamura) Z.Iwats. & Nog.
  • Heterophyllium flaccum (Müll.Hal. & Kindb.) Kindb.
  • Heterophyllium haldaneanum (Grev.) M.Fleisch.
  • Heterophyllium haldaneanum var. viride (S.Okamura) Ihsiba
  • Heterophyllium haldanei Kindb.
  • Heterophyllium sikokianum Sakurai
  • Hypnum badense A.Braun
  • Hypnum cooleyanum Spreng. ex H.H.Eaton
  • Hypnum curvirostrum Brid.
  • Hypnum cylindricum Bruch
  • Hypnum flaccum Müll.Hal. & Kindb.
  • Hypnum haldaneanum Grev.
  • Hypnum haldaneanum var. roellii Renauld & Cardot
  • Hypnum haldanei Grev. ex Milde
  • Hypnum pulchrum Drumm.
  • Hypnum weinmannii Nees
  • Plagiothecium auriculatum Kindb.
  • Plagiothecium brevipungens Kindb.
  • Plagiothecium cuspidatum H.Philib.
  • Stereodon brevipungens (Kindb.) Broth. ex Wijk, Margad. & Florsch.
  • Stereodon flaccus (Müll.Hal. & Kindb.) Broth. ex Paris
  • Stereodon haldaneanus (Grev.) Lindb. ex Rau & E.Britton

and 2 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite. It has no native range either: Kew's checklist does not cover this taxon.