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Legend:

1  seta
3  peritome
2  spore capsule 

English name: Undulate atrichum moss
Scientific name: Atrichum undulata
Familia: Polytrichaceae
Classis: Bryopsida (= Musci)
Phylum: Bryophyta
Regnum: Plantae

The membrane that covers the peristomes shears as a consequence of desiccation