PI. 35. 

 36. 



37- 

 38. 



39- 



40. 



41- 

 42. 



43- 

 44. 



45- 

 46. 



47- 

 48. 

 49. 

 50. 



51- 

 52- 

 53- 



54- 

 55- 

 56. 



57- 

 58. 



LIST OF COLOURED PLATES 



Orchis simia 



militaris 



purpurea 



ustulata 



morio 



mascula. Figs, i, 2, O. mascula x morio 



laxiflora 



„ X mono 

 incarnata 

 incarnata var. dunensis forma atriruhra 



„ vai. pu/del/a x latifolia 

 prcBtermissa 

 A, Orchis maculata; B, O. latifolia 

 Orchis latifolia x maculata 



A, Orchis maculata x prater missa; B, O. latifolia x priBtermissa 

 Orchis maculata (lip variations) 



„ „ Sub-Sp. ^/(5i^(?J- 



A, Orr^/j- incarnata x maculata sub-sp. f/oa'fj-; B, 0. ?naculata x purpurella 

 A, „ purpurella; B, O. purpurella x latifolia; C, O. maculata sub-sp. 

 ^/orfisj- X purpurella 

 Ophrjs muscifera 



A, Ophrjs aranifera x muscifera ; B, O. aranifera. Fig. 2, O. muscifera var. virescens 

 A, „ arachnites; B, O. apifera; C, O. apifera x arachnites 

 A, „ apifera var. Tr(?////; B, 0. tf/)//fra versus Tro////; C, O. apifera var. 

 chlorantha; D, 0. arachnites x aranifera 



A, Ophrjs apifera (peloric form); B, O. apifera var. Tro////; C, O. apifera with 

 anther ^3 developed 



xm 



facing page 166 

 168 



171 



174 



177 



179 

 183 



i8j 



186 



187 



189 



192 



197 



201 

 202 

 206 

 208 

 215 



217 

 225 

 228 

 231 



234 



237 



LIST OF MONOCHROME PLATES 



Plate A 



Fig. I. 

 Fig. 2. 

 Fig. 3. 

 Fig. 4. 



Fig- 5- 

 Fig. 6. 



Plate B 



Orchis purpurea, peloric form. 

 Phases of cell-division. 



Mycorrhiza in root-cells of Epipogon aphjllum. 

 Cjpripedium calceolus, column. 

 Epipactis latifolia, front and side views of column. 

 „ leptochila, front and side views of column. 



Fig. I. Fertilisation of Orchis mascula (after Darwin). 



Fig. 2. Fertilisation oi Anacamptis pjramidalis (after Darwin). 



facing page 6 



facing page 



21 



