8o MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Baccharis halimifolia L. 



A number of shrubs of Baccharis were brought from salt 

 marshes of Staten Island, in November, and placed in the green- 

 houses and dark chambers. These shrubs were about 140 cm. in 

 height. Within a month a number of the buds about 

 the base of the main stems began to grow and de- 

 veloped slender etiolated stems, which bore small 

 lanceolate leaves and which attained a length of a 

 few centimeters and then perished. 



BicucuUa cucuUaria (L.) Millsp. 



A number of the scaly bulbs of BicuctiUa were 

 placed in soil in the dark room in January, 1900, and 

 soon showed leaves. The petioles attained a length 

 of 10 to 18 cm., and the terminal portion immediately 

 below the lamina was curved through a complete 

 revolution in such manner that the undeveloped com- 

 pound lamina was held in a position varying between 

 the inverted vertical and horizontal. The new bulbs 

 formed at the bases of such etiolated leaves were only 

 half the size of the normal, and were entirely free 

 from coloring matter. No unfolding of the compound 

 lamina was shown and the leaves soon perished. A 

 second growth could not be induced. 



The average length of the epidermal cells of the 



etiolated petioles was double that of the normal. The 



palisade tissue on the upper (inner) side of the lami- 



1 . j*^,' \\ 0'°' nae could be distinguished, but the remainder of the 

 lated leal of Bicu- ° 



c«//« with bulbous parenchymatous tissue was closely packed, and no 

 enlargement at stomatal organs were found, a fact in correlation with 

 ^^^^" the short duration of the etiolated leaf. The width 



of the epidermal cells remained exactly the same in etiolations and 

 the increase was shown wholly in length. 



Botrychium obliquum Muhl. 

 Rootstocks of Botrychium were placed in the dark room in Oc- 

 tober, 1899. '^^^ stipe attained a length of 18 cm. below the point 

 where it divided into two branches, one of which was again divided, 

 at a distance of 1.5 cm. The three branches thus shown were 9, 



