ECOLOGY OF WOODLAND PLANTS. 889 
Fig. 57 is a section of a very small leaf from the dwarf form, 
which scarcely rises above the short grass among which it grows. 
The leaf is thinner than the previous type, but has a very compact 
mesophyll—a feature of importance in reducing transpiration. 
Leaves of Vaccinium Myrtillus growing under different conditions, 
Fig. 56. T. S. leaf of typical Moorland form. 
57. T. S, leaf of dwarf small-leaved form. 
58. T. S. leaf of Woodland shade-form. 
59. Hair of leaf. 
60. Multicellular gland of leaf. 
Fig. 58 is a section of a leaf from the form growing in a 
sheltered Oak wood on the Millstone-Grit escarpment. The 
leaf is much larger but thinner than the previous forms; the 
upper epidermis is very slightly cuticularized, air-spaces are 
