MUSCI 6 1 



Fam. 18. Hedwigiaceae. 



A. Leaves without a distinct margin. 



a. Capsule embedded between the apical leaves. 



I. Lamina of leaves papillate, each papilla with 2 or more points. 



Capsule smooth. 



(i) 59. Hedwigia 



II. Papillae with a simple point. Capsule in the dry state grooved. 



(1) 60. Hedwigidium 



b. Capsule stalked. 



(1) 61. Braunia 



(Plate 7, D.) 62. Rhacocarpus 



B. Leaves marginate 



Fam. 19. Fontinalaceae. 



Fam. 20. Leucodontaceae. 



A. Midrib of leaf double or absent. 



a. Lamina of leaf smooth. 



b. Cells papillose. 



B. Midrib single. 

 Fam. 21. Pri on odon taceae. 



(1) 6^- Wardia 



(1) 64. Leucodon 



(1) 65. Pterogonium 



(1) 66. Forsstroemia 



(1) 67. Prionodon 



Fam. 22. Neckeraceae. 



A. Dorsal layer of the teeth of the peristome irregularly thickened, but smooth. 



a. Midrib wanting or very short and double. 



(1) 68. Renauldia 



b. Midrib simple. 



(1) 69. Pterobryopsis 



B. Dorsal layer of teeth normal, mostly papillate, sometimes striate, rarely 



smooth. 



a. Secondary branchlets mostly cylindrical, more or less pendulous. 

 Leaves symmetrical. 



I. Alar cells forming a sharply defined group of square cells. 



(1) 70. Squamidium 



II. Alar cells not well defined. 



1. Midrib double but very short, or absent. Cells of leaf smooth. 



(3) 71. Pilotrichella 



2. Midrib simple. Cells of leaf papillose. 



x Branches not flattened. 



(1) 72. Papillaria 



x x Branches flattened. 



(1) 73. Aerobryopsis 



