286 MINUTE STRUCTURE OF PLANT HYBRIDS. 



Plate VII. 



Fig. 1. Longitudinal section from petiole of Masdevallia amabilis, x 450°. 



Fig. 2. Longitudinal section from petiole of Masdevallia Veitchiana, x 450°. 



Fig. 3. Epidermis bearing cone-shaped hairs from lateral sepals of Masdevallia amabilis, x 450°. 



Fig. 4. Epidermis bearing club-shaped hairs from lateral sepals of Masdevallia Chelsoni, x 450°. 



Fig. 5. Epidermis bearing spheroidal hairs from lateral sepals of Masdevallia Veitchiana, x 450°. 



Fig. 6. Vertical section of lower leaf surface from Rhododendron ciliatum, x 450°. The surface of each epi- 

 dermal cell is slightly convex. 



Fig. 7. Similar section from Rhododendron Grievei, x 450°. The surface of each epidermal cell is enlarged 

 into a conical process. 



Fig. 8. Similar section from Rhododendron glaucum, x 450°. The surface of each epidermal cell forms an 

 evident papilla. 



Fig. 9. Vertical section of lower leaf surface from Rhododendron formosum, x 450°. 



Fig. 10. Similar section from Rhododendron formosum x R. Dalhousice, x 450°. 



Fig. 11. Similar section from Rhododendron Dalhousia?, x 450°. 



Fig. 12. Vertical section of lower leaf surface from Rhododendron Edgeworthii, x 450°. 



Fig. 13. Starch grains from rhizome cells of Hedycliium Gardnerianum, x 500°. 



Fig. 14. Grains from Hedycliium Sadlerianum, x 500°. 



Fig. 15. Grains from Hedychium coronarium, x 500°. 



Fig. 16. Grains from Hedychium elatum, x 500°. 



Fig. 17. Grains from Hedychium elatum x H. coronarium, x 500°. 



Plate VIII. 



Fig. 1. Transverse section, stem of Cytisus purpureus in second year of growth, x 150°. e., epidermis; eft, 



cortex ; s.s., sclerenchyma strand ; ph./., phloem fibres ; ph., phloem proper ; xy. 2 , xylem of 



second year ; xy. 1 , xylem of first year ; p., pith. 

 Fig. 2. Transverse section, stem of Cytisus Adami, x 150°. Letters as above, c, cork, formed as an elliptic 



mass beneath the epidermis. 

 Fig. 2a. Shows developing masses of cork (c.c), forming beneath the epidermis. 

 Fig. 3. Transverse section, stem of Cytisus Laburnum, x 150°. Letters as above. 

 Figs. 4 and 5. Upper and lower leaf epidermis of Cytisus purpureus, x 400°. 

 Figs. 6 and 7. Upper and lower leaf epidermis of Cytisus Adami, x 400°. 

 Figs. 8 and 9. Upper and lower leaf epidermis of Cytisus Laburnum, x 400°. 

 Fig. 10. Epidermal cells of Cytisus purpureus, stained in watery eosin, x 1500°. The figure shows the average 



size of the cell nuclei. In one cell the protoplasm is represented. 

 Fig. 11. Similar cells of Cytisus Adami, x 1500°. 

 Fig. 1 2. Similar cells of Cytisus Laburnum, x 1 500°. 



Fig. 13, a, a', a". Standard, wing, and keel petal of Cytisus purpureus ; nat. size. 

 Fig. 13, b, V, b". Standard, wing, and keel petal of Cytisus Adami; nat. size. 

 Fig. 13, c, c', c". Standard, wing, and keel petal of Cytisus Laburnum ; nat. size. 

 Fig. 14a. Pollen grains of Cytisus purpureus, x 350°. 



Fig. lib. Pollen grains of Cytisus Adami, x 350°. Two of these are abortive. 

 Fig. 14c. Pollen grains of Cytisus Laburnum, x 350°. 



•4r 



3 MAY. 95 



