118 Seward and Gowan.—The Maidenhair 
to the naked eye as a white downy patch. The downy hairs 
of the young leaves suggest a comparison with the woolly 
scale-leaves and young fronds of some Cycads. The older 
hairs may reach a considerable length, and become multi¬ 
cellular, consisting in the basal portion of two rows of cells 
containing numerous chloroplasts ; these long and frequently 
branched filaments are attached to a slight elevation of the 
leaf-tissues. In the younger leaves the twisted and tangled 
hairs are unicellular like those of recent Cycads, and without 
chloroplasts. Fig. 37, PI. IX, represents a young leaf showing 
a deep median incision in the lamina, and the partially inrolled 
margin at ^ ; the short lines on the drawing of the lamina 
indicate the presence of hairs. In Fig. 39, PI. IX, a very young 
foliage-leaf is shown, bearing numerous hairs, and having 
a deeply lobed and strongly folded lamina ; Fig. 41 represents 
an older leaf in which the hairs form a distinct patch, h , at the 
base of the petiole. The long multicellular branched hairs in 
Fig. 56, PI. X, are from the edge of the petiole of a scale-leaf 
possessing a small lamina. 
A drawing of a small seedling Ginkgo has been published 
by Masters 1 in his paper on the comparative morphology 
of the Coniferae, which illustrates the deeply incised and lobed 
form of the lamina characteristic of the leaves of a seedling 
and of the vigorous long shoots of a mature plant. 
The following notes are based on the examination of a seed¬ 
ling measuring 8-5 cm. in length above the cotyledons :—The 
buds were visible in the axils of the cotyledons ; the first green 
leaves are sub-opposite, and 2 cm. above the seed ; the lamina 
of the lowest is obcuneate, and traversed by a few forked veins 
and short secretory canals; in the second leaf there is no definite 
distinction between blade and stalk. The third foliage-leaf 
occurs 3*2 cm. higher on the stem ; it is deeply bilobed, and 
each lobe is cut into three smaller segments. The fourth leaf 
is also deeply bilobed, and the two lobes are coarsely toothed ; 
the petiole and lamina are more sharply differentiated than in 
the third leaf. 
1 Masters (’ 91 ), p. 242. 
