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  • Gymnostomum tetragonum Brid.
    • Reference article Ignatov, M. S. & O. M. Afonina. 1992. Checklist of mosses of the former USSR. Arctoa 1: 1–85.
    • Reference article Flora of North America Editorial Committee. 2007. Bryophytes: Mosses. Fl. N. Amer. 27(1): i–xxi, 1–711.
  • Pyramidula algeriensis Chud. & Douin
    • Reference article Brugués, M., C. Casas & J. Belmonte. 1998. On the status of Pyramidula algeriensis Chadeua & Douin, syn. nov., with observations on the spores of P. tetragona (Brid.) Brid. and Goniomitrium seroi Cas. de Puig in Spain. J. Bryol. 20: 502–504.
  • Pyramidula tetragona var. zoddae Bott. & Zodda
    • Reference article Brugués, M., C. Casas & J. Belmonte. 1998. On the status of Pyramidula algeriensis Chadeua & Douin, syn. nov., with observations on the spores of P. tetragona (Brid.) Brid. and Goniomitrium seroi Cas. de Puig in Spain. J. Bryol. 20: 502–504.
 
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