Ptychomnion aciculare

Plate 1 figs. a–h · 8 separate observations

Ptychomnion aciculare, photographed by Lisa Bennett — fig. c Lisa Bennett, CC BY 4.0 / obs. 190570840

Ptychomnion aciculare, photographed by Saryu Mae 前朝琉 — fig. d Saryu Mae 前朝琉, CC BY 4.0 / obs. 190590099

Ptychomnion aciculare, photographed by Colin Meurk — fig. e Colin Meurk, CC BY-SA 4.0 / obs. 188069742

Ptychomnion aciculare, photographed by Dylan Wishart — fig. g Dylan Wishart, CC BY 4.0 / obs. 182785315

Ptychomnion aciculare, photographed by Stephen Thorpe — fig. h Stephen Thorpe, CC BY 4.0 / obs. 178743800

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 2,013 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-0.9 °C	5.4 °C	10.3 °C
Warmest month, mean daily high	16.2 °C	20.2 °C	25.2 °C
Annual rainfall	779 mm	1,262 mm	3,226 mm
Rainfall in the driest quarter	140 mm	231 mm	623 mm

It is found where winters bring light 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 2,013 research-grade observations of Ptychomnion aciculare 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 Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.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 6 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.

Achyrophyllum aciculare (Brid.) J.Shaw
Hypnum aciculare Brid.
Hypnum cucullifolium P.Beauv.
Ptychomnion aciculare f. longifolium Thér.
Ptychomnion gracillimum Dixon
Stereodon acicularis (Brid.) Mitt.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.

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.