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Pyramidula Brid. Muscol. Recent. Suppl. 4: 20. 1819[1818]. [wfo-4000032284] synonym Pyramitrium Mitt. Trans. & Proc. Roy. Soc. Victoria 19: 61. 1883. [wfo-4000032285] P. tetragona (Brid.) Brid. Muscol. Recent. Suppl. 4: 20. 1819[1818]. [wfo-0001171959]basionym Gymnostomum tetragonum Brid. Muscol. Recent. Suppl. 1: 270. 1806. [wfo-0001174228] homotypic Physcomitrium tetragonum (Brid.) Fürnr. Flora 20: 285. 1837. [wfo-0001151761] homotypic Pyramidium tetragonum (Brid.) Brid. Bryol. Univ. 1: 108. 1826. [wfo-0001171956] synonym Gymnostomum tetragonum Brid. Muscol. Recent. Suppl. 1: 270. 1806. [wfo-0001174228]homotypic Physcomitrium tetragonum (Brid.) Fürnr. Flora 20: 285. 1837. [wfo-0001151761] homotypic Pyramidium tetragonum (Brid.) Brid. Bryol. Univ. 1: 108. 1826. [wfo-0001171956] homotypic Pyramidula tetragona (Brid.) Brid. Muscol. Recent. Suppl. 4: 20. 1819[1818]. [wfo-0001171959] synonym Physcomitrium tetragonum (Brid.) Fürnr. Flora 20: 285. 1837. [wfo-0001151761]basionym Gymnostomum tetragonum Brid. Muscol. Recent. Suppl. 1: 270. 1806. [wfo-0001174228] homotypic Pyramidium tetragonum (Brid.) Brid. Bryol. Univ. 1: 108. 1826. [wfo-0001171956] homotypic Pyramidula tetragona (Brid.) Brid. Muscol. Recent. Suppl. 4: 20. 1819[1818]. [wfo-0001171959] synonym Pyramidium tetragonum (Brid.) Brid. Bryol. Univ. 1: 108. 1826. [wfo-0001171956]basionym Gymnostomum tetragonum Brid. Muscol. Recent. Suppl. 1: 270. 1806. [wfo-0001174228] homotypic Physcomitrium tetragonum (Brid.) Fürnr. Flora 20: 285. 1837. [wfo-0001151761] homotypic Pyramidula tetragona (Brid.) Brid. Muscol. Recent. Suppl. 4: 20. 1819[1818]. [wfo-0001171959] synonym Pyramidula algeriensis Chud. & Douin Pyramidula algeriensis sp. nov.: 1. 1904. [wfo-0001171958] synonym Pyramidula tetragona var. zoddae Bott. Malpighia 24: 269. 1911. [wfo-0001171960] Steppomitra Vondr. & Hadač Bull. Soc. Amis Sci. Lett. Poznań, Sér. D, Sci. Biol. 6: 117. 1965[1966]. [wfo-4000036604]S. hadacii Vondr. Bull. Soc. Amis Sci. Lett. Poznań, Sér. D, Sci. Biol. 6: 118. 1965[1966]. [wfo-0001186628]