PLATE XX. 



1. Zygodon conoideus. 



a. plant, nat. size. c. veil, magnified. 



6. leaf, magnified. d. sporangium, magnified. 



2. Z. viridissimus. 



a. plant, nat. size. c. sporangium, magnified. 



b. leaf, magnified. d. sporangium, after lid has fallen. 



3. Z. lapponicus. 



a. plant, nat. size. c. veil, magnified. 



b. leaf, magnified. d. sporangium, magnified. 



e. sporangium, after lid has fallen. 



4. Orthotrichum cupulatum. 



a. plant, nat. size. c. veil, magnified. 



b. leaf, magnified. d. sporangium, magnified. 



e. portion of peristome magnified. 



5. O. anomalum. 



a. plant, nat. size. c. veil, magnified. 



b. leaf, magnified. d. sporangium with lid, magnified. 



e. sporangium, without lid. 



6. O. diaphanum. 



a. plant, nat. size. c. veil, magnified. 



b. leaves, magnified. d. sporangium, magnified. 



e. portion of peristome, magnified. 



7. 0. pulchellum. 



a. plant, nat. size. c. young veil, magnified. 



b. leaf, magnified. d. sporangium with lid, magnified. 



e. sporangium without lid, magnified. 



8. 0. leiocarpum. 



. plant, nat. size. c. veil, magnified. 



b. leaf, magnified. d. sporangium, magnified. 



e. portion of peristome, magnified. 



