Notes. 
125 
Collinsta grandiflora (Figs. 2, 2 a).-— On the upper surface, near 
the apex of the cotyledons, are one or two water-pores which lead 
down into a large chamber. The guard cells of these pores, as well 
as the epidermal cells around them, often break down and leave a 
Fig. 2. Water-pores over epithem on upper epidermis at end of median vein in 
cotyledon of Collinsia grandiflora. 
Fig. 2 a. Collinsia grandiflora. Apex of upper surface of cotyledon showing 
two water-pores. 
cup-shaped depression near the apex of the upper epidermis. If a 
longitudinal section is made through this chamber and part of the 
median vein, the spiral vessels are seen to end immediately before the 
chamber is reached, but the prosenchyma of the vein runs forwards 
and upwards around the chamber. 
