MUSCI 55 



b. Leaves pluriseriate. 



I. Cells of leaves papillose ; cells of lamina small, parenchymatous. 



(Plate 7, A.) 



Gen. 35 — 40. 11. Orthotrichiaceae 



II. Leaves smooth. 



1 . Cells of leaves large. 



X 'Teeth of exostome opposite the divisions of the inner peristome, not 

 lamellate. (Plate 7, B.) 



Gen. 41 — 43. 12. Funariaceae 



x x Teeth of exostome alternate with the divisions of the inner peristome, 

 lamellate. 



o Cells near apex of leaves prosenchymatous. 



Gen. 44 — 51. 13. Bryaceae 



00 Cells near apex of leaves parenchymatous. 



Gen. 52. 14. Mniaceae 



2. Cells of leaves small, parenchymatous. Sexual organs radical or 



lateral. 



Gen. 53. 15. Rhizogoniaceae 



III. Cells of lamina small, mostly parenchymatous, mammillate on both 



sides of the leaf. Capsule nearly globose, longitudinally striate. 

 Teeth of inner peristome split down to their base into two 

 spreading lobes. (Plate 7, C.) 



Gen. 54—57. 16. Bartramiaceae 



B. Capsules borne on lateral branchlets, which are mostly very short, rarely 

 somewhat elongated. 



a. Peristome absent. 



I. Foliage of stem flattened out. 



Gen. 58. 17. Erpodiaceae 



II. Foliage arranged evenly around the stem. (Plate 7, D.) 



Gen. 59 — 62. 18. Hedwigiaceae 



b. Peristome present. 



I. Perichaetial branch more or less elongated. Aquatic plants. 



Gen. 63. 19. Fontinalaceae 



II. Perichaetial branch very short. Mostly terrestrial plants. 



1. Cells near margin of base of leaves modified, i.e. several rows of cells 

 are smaller, square or rounded or even broader than long, and 

 specially thickened. 



x Main axis stoloniform. heaves smooth. 



Gen. 64 — 66. 20. Leucodontaceae 



