[Home]
[Up]

Fig. 3.5-2. Transverse section of water lily petiole (Nymphaea). The large round, empty-looking cells marked by Xs are sieve tube members, similar to those shown in longitudinal section in Fig. 3.5-1. The small angular cells (three are indicated by arrows) that are almost filled with red contents are companion cells, which control the metabolism of the sieve tube members.