MACROSCOPIC AND MICROSCOPIC CHARACTERS OP PLANTS. 



815 



they are distinctly long and narrow. In the hybrid the 

 cells are smaller than in either parent, but in the pro- 

 portion of length to width they are almost mid-inter- 

 mediate between the two parents. (Table J 48.) 



Hairs like those on the sepals and petals are present 

 on the upper epidermis at the base of the labellum. 

 They are very rare, but less rare in the hybrid than in 

 either parent — 1 in 25 fields in M. vexillaria, 1 in 20 

 fields in M. rcezlii, 1 in 2% fields in M. bleuana. 



These hairs are slightly shorter in M. vexillaria than 

 in M. rcezlii, and longer in the hybrid than in either 

 parent. (Table J 48.) The number is, 1 to 2.2 fields in 

 M. vexillaria, 1 in 2.0 fields in M. rcezlii, 1 in 2.33 fields 

 in M. bleuana. 



Sections of the upper epidermis of the labellum were 

 examined at the middle of one of the lobes. The cells 

 are papillose in all three plants, and larger in M. vexil- 

 laria than in M. rcezlii, but smaller in the hybrid than in 

 either parent. (Table J 48.) 



The average number of hairs in a field for M. vexil- 

 laria is 1 in 50 fields; for M. rcezlii 1 in 20 fields; for 

 M. bleuana 1 in 17 fields. 



Sections of the lower epidermis of the labellum were 

 examined at the middle of the labellum. The cells of 

 M. vexillaria are larger than those of M. rcezlii, while 

 those of the hybrid are almost exactly mid-intermediate 

 in length, but are narrower than in either parent. (Table 

 J 48.) 



Stomaia are present on the lower epidermis: In M. 

 vexillaria 1 in 18 fields; in M. rcezlii 1 in 30 fields; and 

 in the hybrid 1 in 6 fields. 



Comparative Summaht of the Character of the 

 Hybrid Miltonia bleuana and its Parent-stocks. 



The hybrid was found to be : 



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

 parent: In the thickness of the pseudobulb; length and 

 width of the dorsal sepal ; length of lateral sepal ; length 

 and width of petals; color of base of petal; length of 

 column; width of bundle in the transverse section of 



