Physcomitrium pyriforme

Common bladder-moss
Scientific classification
Kingdom:	Plantae
Division:	Bryophyta
Class:	Bryopsida
Subclass:	Funariidae
Order:	Funariales
Family:	Funariaceae
Genus:	Physcomitrium
Species:	P. pyriforme
Binomial name
Physcomitrium pyriforme Hedw.

Physcomitrium pyriforme, commonly known as common bladder-moss, is a bryophyte native to all continents except South America and Antarctica. Its capsules mature beginning in late fall and through the spring. It is most commonly found in wet soils in disturbed locations. A highly variable species, size, leaf characters and shape of the capsule vary across its range, but often within populations as well.

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Wikipedia