Grimmia torquataHook.

grimmia dry rock moss

WFO wfo-0001173900 Accepted WFO 2026-06 8 photographs CC0

Plate 1 figs. a–h · 5 observations

This species has been photographed under an open licence only 5 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Grimmia torquata, photographed by Braden J. Judson
fig. a Braden J. Judson, CC0 1.0 / 2022-05-02 / obs. 196891513

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.

Where it actually grows measured, from 41 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -7.9 °C 0.3 °C 2.4 °C
Warmest month, mean daily high 15.4 °C 22.0 °C 24.0 °C
Annual rainfall 1,260 mm 1,775 mm 3,160 mm
Rainfall in the driest quarter 101 mm 159 mm 475 mm

It is found where winters bring hard frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 41 research-grade observations of Grimmia torquata 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 Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.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 20 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.

  • Dryptodon torquatus (Hook.) Brid.
  • Eugrimmia torquata (Hook.) Buyss.
  • Grimmia cernua f. atra Nees & Hornsch.
  • Grimmia pellucida (Kindb.) Kindb. ex Greven
  • Grimmia prolifera Müll.Hal. & Kindb.
  • Grimmia spiralis var. torta (Nees & Hornsch.) Spruce
  • Grimmia streptophylla Kindb.
  • Grimmia torquata f. gracilis Medelius ex H.A.Möller
  • Grimmia torquata f. longipila H.A.Möller
  • Grimmia torquata f. nigrescens H.A.Möller
  • Grimmia torquata subsp. pellucida (Kindb.) Paris
  • Grimmia torquata subsp. pseudotorquata (Kindb.) Paris
  • Grimmia torquata var. torquata
  • Grimmia torta Nees & Hornsch.
  • Grimmia tortifolia Kindb.
  • Grimmia tortifolia subsp. pellucida Kindb.
  • Grimmia tortifolia subsp. pseudotorquata Kindb.
  • Grimmia tortifolia var. pseudotorquata Kindb. ex Paris
  • Grimmia uncinata subsp. torquata (Hook.) Hampe
  • Zygodon torquatus (Hook.) Liebm.

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.