Genus Statice as represented at Blakeney Point. /. 267 
An examination of the stereome in the petiolar region further illus- 
trates the effect of environmental conditions on its development (Text- 
fig. 16). The petiole of the broad-leaved form (b) is clearly intermediate 
Text-fig. 15. Diagram of part of the leaf blade of S. binervosa (a-e) and .S’, bellidifolia (f) in its 
middle region, showing the distribution of the stereome. x 30. a = narrow-leaved plant ; b = sand 
plant ; c — mud plant ; D = plant from experimental area ; E — broad-leaved form. vb. = mid- 
vein ; sc. — sclerenchyma sheath ; sc. 1. — sclereides. Vascular bundles dotted ; stereome black. 
between the narrow-leaved plant (A) and S. bellidifolia (d). In the ex- 
perimental plant there is little difference in the proportion present, but, 
as in the case of the root and stem, culture greatly diminishes the 
development of mechanical tissue (c). Not only does culture with its 
more favourable conditions diminish the proportion of stereome present, 
