Physcomitrium pyriforme (Hedw.) Hampe
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Floras and Monographs
Physcomitrium pyriforme (Hedw.) Hampe: [Article] Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1): 1-452.