MACROSCOPIC AND MICROSCOPIC CHARACTERS OF PLANTS. 



803 



of pale yellow chromoplasts iu the upper epidermal cells 

 and papillae. 



On the lower surface of the lateral lube of the labellum 

 the cells are longer and wider in C. lowianum than in 

 C. eburneum. In length the cells of the hybrid are be- 

 tween those of the two parents, but nearer C. lowianum 

 than C. eburneum; but in width they are wider than in 

 either parent. (Table J 27.) 



On the inner surface of the labellum at the base 

 of the wide band the cells have thick walls and show 

 remarkably well the spaces in the walls between adjoin- 

 ing cells. The cells are smaller in C. lowianum than in 

 C. eburneum, and smaller in the hybrid than in either 

 parent. (Table J 27.) 



The flat band above referred to rises gradually to 

 form ridges (2 in C. lowianum and the hybrid and 3 in 

 C. eburneum) which end in crests that are yellow in 

 C. lowianum and C. eburnum and brownish in the 

 hybrid. The cells are papillose. The papilla are long 

 and narrow in C. lowianum; shorter and wider in C. 

 eburneum; and of varying size in the hybrid, somewhere 

 near a mean between the tivo parents. There are short 

 wide papilla? in the hybrid, but not as short and wide as 

 in C. eburneum; and low narrow papilla;, but not as long 

 and narrow as in C. lowianum. In the hybrid the average 

 length is nearer that of C. eburneum, but the width is 

 fairly mid-intermediate between those of the parents. 

 (Table J 27.) 



The cells of the inner epidermis at the base of the 

 column are shorter but wider in C. lowianum than in 

 C. eburneum, and are smaller in the hybrid than in 

 either parent. (Table J 27.) 



COMPAKATIVE SUMMARY OF THE CHARACTERS OF THE 



HYBRID CYMBIDIUM EBURNEO-LOWIANUM AND 



ITS PARENT-STOCKS. 



The hybrid was found to be : 



(1) The same or practically the same as the seed 

 parent: In the length of the dorsal sepal; width of the 

 column ; width of the endodermal cells on the transverse 

 section of the root; width of the upper epidermal cells 

 at the middle of the leaf; width of the lower epidermal 

 cells at the middle of the leaf ; width of the aqueous tissue 

 cells on the transverse section of the leaf at the midrib ; 

 number of upper sclerenchyma strands in the transverse 

 section of the leaf halfway between the midrib and the 

 margin ; width of the lower epidermal cells of the dorsal 

 sepal ; width of the lower epidermal cells of the petals. 



(2) The same or practically the same as the pollen 

 parent: In the length of the pseudobulbs; width of the 

 old leaves ; width of the young leaves ; the main color of 

 the inner surface of the column ; shape of the epidermal 

 cells on the transverse section of the root; number of 

 stomata on the lower epidermis of the leaf at the apex ; 

 the width of the midrib bundle, and the diameter of the 

 largest vessels in the transverse sections of the leaf at the 

 midrib ; the number of mesophyll layers, width of the 

 upper sclerenchyma strands in the transverse sections of 

 the leaf halfway between the midrib and the margin ; the 

 width of the upper epidermal cells of the dorsal sepal. 



(3) The same or practically the same as both parents: 

 In the appearance of the roots; diameter of the flower- 

 stalk ; shape of the dorsal sepal ; length of the lateral 

 sepals ; color of the outer surface of the labellum ; shape 



of the upper epidermal cells of the leaf; presence of crys- 

 tals and thickness of the walls of the upper epidermal 

 cells of the leaf; shape of the lower epidermal cells, and 

 thickness of walls of the lower epidermal cells of the 

 leaf; shape of the upper epidermal cells of the dorsal 

 sepal and the thickness of the walls of the upper epider- 

 mal cells of the dorsal sepal ; color of the upper surface 

 of the lateral lobes of the labellum. 



(4) Intermediate: In the amount of drooping of 

 leaves $ ; length of old leaves 9 ; length of young leaves 



$ ; number of leaves to growth ; length of flower-stalk 9 ; 

 length of bract 9 ; length of pedicles 9 ; number of 

 flowers ; width of dorsal sepal 9 ; width of lateral sepals 

 9 ; color of the lower surface of the sepals ; background 

 of the upper surface of the sepals; length of the lateral 

 petals ; width of the lateral petals 9 ; color of the petals ; 

 width of the labellum 9 ; color of the inner surface of 

 the tube of the labellum; color at tip of crest; color of V 

 mark on anterior lobe of labellum 9 * ; length of column 

 .$ ; specks on the inner surface of the column; color of 

 the outer surface of the column ; average width of the 

 velamen 9 ; width of the cortex, number of sclerosed 

 cells in the cortex <J ; thickness of walls of these sclerosed 

 cells 3 , depth of the endodermal cells, and the diameter 

 of the largest vessels 3 in the transverse section of the 

 root; length of the upper epidermal cells at the middle 

 of the leaf $ ; length 9 , and width of the lower epider- 

 mal cells of the leaf at the apex ; length 9 and width 9 

 of the lower epidermal cells of the leaf at the base ; num- 

 ber of stomata on the lower epidermis of the leaf at the 

 base ; depth of the lower epidermis 9 on the transverse 

 section of the leaf at the midrib ; depth of the upper epi- 

 dermis, depth of the lower epidermis 3 , and the number 

 of lower sclerenehyma strands 9 on the transverse section 

 of the leaf halfway between the midrib and margin; 

 length of the lower epidermal cells of the dorsal sepal 9 ; 

 length of the upper epidermal cells of the petals ; shape of 

 the papillaa and length of the papilla? 9 and color on the 

 upper epidermis of the anterior lobe of the labellum; 

 width of the upper epidermal cells of the lateral lobe of 

 the labellum $ ; shape of the papilla?, and length of the 

 papillfe 9 on the upper surface of the lateral lobe of the 

 labellum; length of the lower epidermal cells of the 

 lateral lobe of the labellum 9 ; length $ and width of 

 the papillae on the crests. 



(5) Higher than in eitlier parent : In the color of the 

 lines on the upper surface of the sepals 9 ; length of the 

 labellum $ ; width 9 and the depth $ of the epidermal 

 cells on the transverse section of the root; length $ 

 and the width $ of the upper epidermal cells' of the leaf 

 at the apex ; length S of the upper epidermal cells of the 

 leaf at the base ; length S of the lower epidermal cells 

 of the leaf at the middle ; depth of the upper epidermal 

 cells 9 , depth of the aqueous tissue S in the transverse 

 section of the leaf at the midrib ; length of the upper 

 epidermal cells of the dorsal sepal 9 ; width of the upper 

 epidermal cells of the petals S ; length of the lower epi- 

 dermal cells of the petals 9 ; width of the lower epider- 

 mal cells of the lateral lobe of the labellum 9 . 



(6) Lower than in either parent: In the number of 

 phloem patches 9 on the transverse section of the root; 



* Macroscopically almost identical with 9 > but microscopi- 

 cally more yellow chromoplasits are present and less red-violet 

 sap. 



