OF THE LEAVES OF BRITISH GRASSES, 359 
PLATE 40, 
Fig. 53. Part of upper epidermis (ep.') of Festuca ovina. (Camera lucida, x 250.) 
54. Part of lower epidermis (ep.") of the same leaf, showing also subepidermal stereome (sf.). (C. 1., 
x 250.) 
55. Part of upper epidermis of leaf of Lolium temulentum. 
56. Part of lower epidermis of same leaf. (C. 1., x 250.) 
57. Motor cells (m.) from same leaf as figs. 55 and 56. (C. L, x 250.) 
58 & 59. Cells of upper and lower epidermis from leaf of Triodia decumbens. Fig. 58 shows also 
the small mesophyll-cells. (C. 1., x 250.) 
60 & 61. Cells of upper and lower epidermis from leaf of Mibora verna. (C.1., x 250.) 
62. The same from leaf of Festuca duriuscula, showing also a group of stereome-cells. (C. 1., 
x 250.) 
63. Papillose cells from upper epidermis from the leaf of Glyceria fluitans. (C. l, x about 250.) 
64. Part of upper epidermis of the leaf of Nardus stricta, showing hairs. (C. 1l, x 250.) 
65. Part of transverse section of leaf of Setaria viridis (mes., mesophyll ; o.s., outer bundle-sheath). 
(C. L, x 250.) 
66. The same of Hierochloé borealis (stom., stoma). (C. L, x 250.) 
67. Part of transverse section of leaf of Aira cespitosa, showing motor cells underlying colourless 
cells and band of stereome. The green mesophyll-cells are shaded. (C.1., x 250.) 
68. Marginal band of stereome from leaf of Avena alpina. (C. l., x 250.) 
69. Vascular bundle of first order from the leaf of Festuca pratensis (C. l., x about 300) (i.s., inner 
bundle-sheath ; zy., xylem-vessels). 
70. Vascular bundle of second order from leaf of Elymus arenarius. (C.1., x about 300.) 
71. Vascular bundle of third order from leaf of Agropyrum repens. (C.1., x about 300.) 
72. Part of transverse section of leaf of Poa rigida, to show arrangement of mesophyll-cells. 
(C. 1, x about 250.) 
73. Transverse section of leaf of Milium effusum. (C. l., x 250.) 
74. Longitudinal section of leaf of same, to show mesophyll. (C.1., x 250.) 
75. The same of Hierochloé borealis, showing also motor cells. (C. 1., x 250.) 
SECOND SERIES.— BOTANY, VOL. VI. 3 F 
