154 Seward and Gowan.—The Maidenhair Tree. 
Fig. 44. Embryo separated from the endosperm (nat. size). 
Fig. 45. Seed of Ginkgo, showing the woody testa b, the endosperm d, and 
the remains of the nucellus c (nat. size). 
Fig. 46. Ginkgo digitata , from the Inferior Oolite (nat. size. Manchester 
Museum). 
Fig. 47. A young ovule in median longitudinal section, i = integument; 
pc = pollen-chamber ; e — young embryo-sac (slightly enlarged). 
Fig. 48. Apical view of the endosperm of a fallen seed showing two archegonia, 
a, a (slightly enlarged). 
PLATE X. 
Fig. 49. Tangential section through the autumn wood of a branch. 
Fig. 50. Transverse section of the filament of a stamen, px = protoxylem ; 
cp = centripetal xylem; is — transfusion tracheids. 
Fig. 51. Transverse section of a young primary shoot, e = endodermis. 
Fig* 5 2 * Longitudinal section through the phloem of a branch. 
Fig* 53* Transverse section through part of the stele of a short shoot. 
It = double leaf-trace. 
Fig. 54. Ginkgo digitata , from the Inferior Oolite near Scarborough (slightly 
reduced. York Museum). 
Fig* 55. Transverse section of the root of a seedling. 
Fig. 56. Multicellular hairs from the petiole of a scale-leaf. 
Fig. 57. Radial longitudinal section through the secondary xylem of a branch 
showing tracheids and medullary-ray cells. 
Fig. 58. Transverse section of a portion of the xylem of a short shoot. 
Fig. 59. Tangential section through the cortex of a short shoot, x = group of 
tracheids. 
Fig. 60. Schizaea dic/iotoma, Siv. (slightly enlarged. The Herbarium, 
Cambridge). 
Fig. 61. Modified foliage-leaf of Ginkgo biloba bearing a marginal ovule (after 
Fujii). 
Figs. 62-66. Leaves of Ginkgo biloba. 
Fig. 67. Actinopteris radiata, Link (nat. size). 
Fig. 68. Baiera gracilis , Bunb., from the Inferior Oolite of Yorkshire (British 
Museum) (nat. size). 
Fig. 69. Ginkgo sp., from Eyeford (slightly reduced. Cirencester Museum). 
Fig. 70. Leaf of Ginkgo biloba. 
