82 SIR J. LUBBOCK—PHYTOBIOLOGICAL OBSERVATIONS. 
nerves slender, alternately nerved upwards, reticulate, shining and 
thinly pubescent on both surfaces, deep green above, paler beneath, 
petiolate; lobes oblong-obtuse, with a strong nerve running 
into each, the basal ones always largest and sometimes ovate ; 
Fig. 168. 
Tilia vulgaris. Seedling. Nat. size. 
middle pair of lobes always the smallest, and oblong or subulate ; 
lamina 15-21 millim. long, 17-25 millim. from tip to tip of the 
basal pair of lobes; petiole semiterete, shallowly channelled above, 
pubescent, 6-8 millim. long. 
The fruit is an ovoid or subglobose nut, with five obtuse 
angles, tomentose with somewhat rufous hairs, one-celled by the 
rupture of the septum, one-seeded, indehiscent, tipped with the 
persistent base of the style, woody, attached.to a large deciduous 
bract which serves to disseminate it by the aid of the wind. 
The seed is ascending or erect, obovoid or subglobose, deep 
brown, smooth, with a firm or crustaceous testa of two distinct 
layers; hilum oval, comparatively large on the ventral aspect a 
little above the base, and longitudinal; raphe ventral, proceeding 
from the hilum to the apex of the seed; chalaza apical, promi- 
