1889.] BOTANICAL GAZETTE. 8 1 



ticularized at the stomatic furrows than elsewhere. The in- 

 tercellular cavity shows numerous and somewhat prominent 

 infoldings, a characteristic common also to Pinus. The con- 

 tents of the guard cells are protoplasm and chlorophyll with 

 their included bodies. 



A transverse section usually shows eight stomata, in rel- 

 atively definite positions, six on the outer and two on the 

 inner surface of the leaf. In exceptional cases the number 

 may vary upon the outer surface, but in the sections exam- 

 ined no more than two have been detected upon the inner 

 surface. Upon the upper surface the stomata are usually 

 about equidistant from each other. Those of the inner sur- 

 face seem to be placed about midway between perpendicu- 

 lars let fall from two of the upper stomata. (Figs. 2, 3, 4, 5 

 and 7.) 



The stomatic system seems to be of the simplest and is 

 much different from that in Pinus sylvestris in the shape and 

 thickening of guard-cells, in the modifications of the subsidi- 

 ary and surrounding epidermal cells, and in the shape and 

 outline of the furrow. The similarity consists chiefly in the 

 relatively large respiratory cavities and the infoldings men- 

 tioned above. As a whole, in comparison with Pinus the 

 stomatic mechanism seems much less completely developed 

 both as regards its differentiation from the surrounding tis- 

 sues and its means for controlling transpiration. (Cf. figs. 



7 



Purdue University , Lafayett 



OPEN LETTERS. 



The " King-Devil. 'I 



In connection with Mr. Lester F. Ward's article on the " King-Devil " 



in the January Gazette, it may De interesting to note that Hieracium 

 aurantiacum L. has appeared on my place here. The locality is in a wet 

 meadow, and I first discovered it in the summer of 1884, when there was 

 a single flowering stalk. This has increased slowly until last summer 

 there were six or eight flowering stalks, but so far it has shown no indi- 

 cations of becoming a troublesome weed. As to the manner of its intro- 

 duction, I can only say that my uncle, the late Mr. Oscar Harger, of New 

 Haven, once had the plant growing in his garden, and it may have been 

 introduced from there in some way, although as the distance is about fif- 



teen miles, the probability seems small. E. B. Harger. 



Oxford, Conn, 



