Physcomitrium pyriforme (Common Bladder Moss)

Plate 1 figs. a–h · 8 separate observations

Physcomitrium pyriforme, photographed by Татьяна Максимова — fig. a Татьяна Максимова, CC BY 4.0 / 2022-05-29 / obs. 202134465

Physcomitrium pyriforme, photographed by Alexandr Stanislavschi — fig. b Alexandr Stanislavschi, CC BY 4.0 / obs. 195095553

Physcomitrium pyriforme, photographed by Christian Berg — fig. c Christian Berg, CC BY 4.0 / obs. 195027349

Physcomitrium pyriforme, photographed by Roger Rittmaster — fig. d Roger Rittmaster, CC BY 4.0 / obs. 193381584

Physcomitrium pyriforme, photographed by Randal — fig. f Randal, CC0 1.0 / obs. 187203055

Physcomitrium pyriforme, photographed by Zachary Dankowicz — fig. h Zachary Dankowicz, CC BY 4.0 / obs. 185108405

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 1,582 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-10.8 °C	-3.5 °C	4.9 °C
Warmest month, mean daily high	21.4 °C	28.9 °C	34.2 °C
Annual rainfall	642 mm	1,129 mm	1,442 mm
Rainfall in the driest quarter	98 mm	222 mm	299 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 1,582 research-grade observations of Physcomitrium pyriforme 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 Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.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 56 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.

Bryum pyriforme (Hedw.) With.
Entosthodon physcomitrioides Müll.Hal.
Gymnostomum dilatatum P.Beauv.
Gymnostomum fasciculare var. schultzii Nees & Hornsch.
Gymnostomum pyriforme Hedw.
Gymnostomum splachnoideum P.Beauv.
Gymnostomum tortipes Brid.
Gymnostomum turbinatum Michx.
Phascum pyriforme Sw.
Physcomitrium acuminatum var. marianum J.J.Amann
Physcomitrium australe E.Britton
Physcomitrium conicum Mitt.
Physcomitrium drummondii E.Britton
Physcomitrium eurystomum f. limbatum (Warnst.) F.Koppe
Physcomitrium fasciculare var. schultzii (Nees & Hornsch.) Brid.
Physcomitrium hookeri var. serratum Renauld & Cardot
Physcomitrium kellermanii E.Britton
Physcomitrium kellermanii var. drummondii (E.Britton) Grout
Physcomitrium langloisii (Renauld & Cardot) Kindb.
Physcomitrium martianovii f. majus (Broth.) Smirnova
Physcomitrium martianovii var. majus Broth.
Physcomitrium megalocarpum Kindb.
Physcomitrium microcarpum Kindb.
Physcomitrium piriforme Schimp.

and 32 more.

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.
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.