OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
361 
PLATE 22. 
Lepicloclendron. 
Fig. 33. Transverse section of part of a stem of Lepicloclendron selaginoides. 
c. Medullary vascular zone. d. Exogenous vascular zone. g. Inner 
bark. n. Inner parenchymatous portion of outer bark. m. Foliar vas- 
cular bundles, m . Foliar vascular bundle, issuing from the exterior of 
the medullary vascular zone c, and passing outwards through the 
exogenous vascular zone cl. Enlarged 14 diameters 
Fig. 34. Longitudinal section of a branch of Lepicloclendron selaginoides. 
a. Medullary axis composed of intermingled cells and vessels, the latter 
alone composing the periphery of the structure, cl. Exogenous vascular 
layer, g. Inner parenchymatous bark. h. Middle parenchymatous bark. 
i. Prosencliymatous layer of the bark. 1. Persistent bases of leaves. 
m. Vascular leaf-bundles. Enlarged nearly 3 diameters. 
Fig. 35. Portion of fig. 34 further enlarged, c. Vessels of the medullary axis. 
cl. Exogenous vascular zone. g. Inner bark. m. Foliar vascular bundle 
passing outwards through the exogenous zone. Enlarged 14 diameters. 
PLATE 21. 
Fig. 36. Tangential section of a portion of the exogenous vascular zone of fig. 34. 
e. Vessels of the exogenous zone, f Medullary rays, m, m. Lenticular 
openings through which the foliar vascular bundles passed outwards 
through the exogenous zone. Enlarged 16 diameters. 
Fig. 37. Portion of the section, fig. 34. Enlarged 10 diameters, c. Vessels of the 
medullary axis. cl. Exogenous vascular layer, g, g. Inner parenchy- 
matous bark, m, m. Two foliar vascular bundles. 
PLATE 22. 
Fig. 38. Prosencliymatous cells from the sporangium wall of a Lepidostrobus from 
Halifax. Enlarged 106 diameters. 
Figs. 39 to 47. Various states of the mother or sister cells and the spores of the 
Halifax Lepidostrobus. Enlarged 106 diameters. 
Fig. 48. Three microspores from a crushed Lepidostrobus from Halifax. Enlarged 
106 diameters. 
Figs. 49-50. Clusters of microspores from two Lepidostrobi from near Oldham. 
Enlarged 106 diameters. 
Fig. 51. Similar cluster of four spores from the recent Lycopodium alpinum. 
Enlarged 106 diameters. 
3 A 2 
