56 MUSCI 



x x Main axis rhizome-tike. Cells of leaf papillate. 



Gen. 6~. 21. Prionodontaceae 



2. Cells at base of leaf normal or merely alate. 



x Cells of stem not thickened. 



o Am phi gastrin absent. 



\ Calyptra hood-shaped. 



Gen. 8 i — 83. 24. Fabroniaceae 



§8 Calyptra conical. 



Gen. 84 — 86. 25. Hookeriaceae 



00 Amphigastria present. (Plate 7, F.) 



Gen. 87. 26. Hypopterygiaceae 



x x Marginal cells of stem thickened, lumen small. 

 o Dorsal leaves not different from the others. 



§ Plants not shining. Cells of lamina parenchymatous, mostly 

 papillose. 



Gen. 88 — 91. 27. Leskeaceae 



§§ Plants more or less shining. Cells oj lamina proseuchymatous, 

 mostly smooth. 



f Capsule mostly erect, regular. 



! Alar cells not or only slightly modified. (Plate 7, E.) 



Gen. 68 — 78. 22. Neckeraceae 



! ! Alar cells differentiated, numerous, square or broader than 

 long. 

 Gen. 79, 80. 23. Entodontaceae 



t f Capsule more or less inclined, irregular, often quite curved. 

 ! One row of the alar cells inflated, elongated, thin-walled; 

 midrib short and double or absent. Lid with a needle- 

 shaped beak. 



Gen. 94. 29. Sematophyllaceae 



! ! Alar cells all alike, or in some layers square or elongate- 

 six-sided, thickened. 

 A Midrib mostly very short and double or absent. 



Gen. 92, 93. 28. Hypnaceae 



AA Midrib simple, mostly reaching nearly to the apex of the 

 leaf. 

 Gen. 95 — 99. 30. Brachytheciaceae 



00 Dorsal leaves much smaller than the others, distichous. 



Gen. 100. 31. Rhacopilaceae 



II. Suborder PoLYTRICHINEAE. 



Gen. 101 103. (Fig. 43.) 32- Polytrichaceae 



