PLATE XL 
TYPHA LATIFOLIA AND CALENDRA PERTINAX 
Typha latifolia: 11, Cross section of leaf. 12, Cross section of a small part of leaf, show- 
ing more detail. 13, Cells of rhizome filled with starch grains. (Dormant season.) 14, Part 
of 12 enlarged to show structure of epidermis, chlorophyll, supporting tissue, and vascular 
bundles. 15, Cells of rhizome partly filled with starch grains. (Growing season.) 
18, New offsets 
Calendra pertinax: 16, Egg. 17, Egg inserted in sheath of cat-tail. 19, Rhizome of 
cat-tail cut open to show larval work. 20, Newly hatched larva 
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