240 



DR J. M. MACFARLANE ON THE 



/ Cypripediiun 

 Spiceriamun. 



','. Cypripedium 

 Leeanum. 



3. Cypripedium 

 insigne. 



six to seven and a half cells. In C. Leeanum the lower half showed eleven to fourteen, 

 the upper half ten to twelve. In C. insigne the lower half showed fifteen to seventeen, 

 over the upper half thirteen to fifteen. This gives an average of 6^ : 12 : 15. 



In C. Spicerianum the lower epidermal cells and the stomata were distributed as 

 follows : — 



Base, . 



5 stomata and 21 





epidermal cells 



Between base and middle, 



4-5 



23 





>> )> 



Middle, . 



6-7 



27 





M J> 



Above middle, . 



6 



25 





>r j> 



Near apex, 



7 



25 





» >> 



Apex, 



. 6-7 



25- 



■26 



)> » 



In C. Leeanum as follows : — 



Base, 



5-6 stomata and 27 





epidermal cells. 



Between base and middle, 



6 



30 





>> >? 



Middle, . 



7 



32 





» » 



Above middle, . 



8 



35 





)» » 



Near apex, 



8-9 



37 





)> >> 



Apex, 



9 



38- 



•40 



» » 



In C. insigne as follows : — 



Base, 



Between base and middle, 



Middle, . 



Above middle, . 



Near apex, 



Apex, 



7 stomata and 40-43 epidermal cells. 



8 „ 45 



9 „ 45-48 

 9 „ 45-46 



10 „ 45-46 

 10 „ 45-48 



Thus the average number of stomata in the first is five, and of epidermal cells 

 twenty -four to twenty -four and a half ; in the second, of stomata seven to seven and a 

 quarter, and of epidermal cells thirty-three ; in the third, of stomata eight and three- 

 quarters, and of epidermal cells forty-five. 



On transverse section at one-fourth length from the leaf apex the upper 

 epidermis in C. Spicerianum shows deep columnar cells, varying from 440// to 460 m 

 in depth, and continued from midrib region to about the middle of each laminar 

 half; they then become shallower, passiug from 350m to 240m, and near the margin 

 are reduced to 60 m in depth. In C. Leeanum those on either side of the 

 midrib are 400 m to 430 m in depth, they then fall to 350-380 m, again to 280 m, 

 then to 200-220 m, and near the margin they are 60 m in depth. In C. insigne 

 those on either side of the midrib are 380-400 m in depth, they then fall to 

 360-380 m, then to 320-350 m, then to 280-300 m at the middle of each laminar 

 half; they then decrease rather suddenly to 140-160 m, then to 100-120 m, and near tbe 

 margin they are 60 m in depth. If the variability in the hybrid about the middle of 

 tbe inner half of the lamina be constant, it might indicate an unstable and wavering 



