BY MAKJOKIE I. COLLINS. 



335 



meiit in Mi/oporum serratum and Eremophila latifolia give additional evidence in 

 support of this view. 



The most common type of gland in the Mijoporitieae is that found in species 

 oi Myoporum. e.g., (M. serratum var. insulare I?. Br., and 3/. serratum var. vis- 

 cosiim R.Br.), where a large shield, consisting cf four cells in a row, is placed 

 e.xeentrically upon a stalk of two cells. 



Gland Bevelopment. 



Myoporum serratum. — In the initial stages of gland formation a splierical 

 projection from an epidermal cell is cut off from the remaining epidermal cells 

 by a transverse wall (Text-tig. 11a, b). A second transverse division differen- 

 tiates the gland rudiment into head and stalk regions (Text-fig. lie). A third 

 transverse division now takes place in the stalk (Text-fig. lid), and is immediately- 

 followed by a vertical division in the median plane of the head (Text-tig. lie). 

 The 5th and 6th divisions are also vertical in the head, and parallel to the first head 

 division (Text-tig. 11/). Growth of the cells continues after division has ceased. 



Text-fig. 11. — (a-f). Stages in the development of the glandular hairs of Afyoponitii 

 serratum ; g, /i, surface and lateral views of the glands, (x 280). 



