8 14 Spratt. — Formation of Root Nodules in the Podocarpineae . 
Fig. ii. Transverse section of a root of Podocarpus chilina with a mature nodule attached. 
p.x. = protoxylem, s.x.— secondary xylem. x 105. 
Fig. 12. Longitudinal section of a root of Podocarpus elongata with a nodule at the beginning 
of its second year, showing the meristematic zone, m.z. f which will produce the new cortical tissue 
of the nodule, x 105. 
PLATE LXXIX. 
Fig. 13. Longitudinal section of a root of Podocarpus elongata with a nodule in the second year 
of its growth, when the new cortex has been formed. n.c.= newly formed cortex, o.c. = old cortex, 
x 105. 
Fig. 14. Longitudinal section of a root of Podocarpus chilina with a nodule several years old. 
1 = new tissue, 2, 3, 4, 5 = layers of tissue which formed the cortex of the nodule in preceding years, 
c = cork, x 105. 
Fig. 15. Cortical cells of the nodule of Podocarpus Totara with Bacteria, i.t. = infection threads, 
n = nucleus of the host cell ; a , c, and d are nuclei in stages of direct division, x 730. 
Fig. 16. Cortical cells of the root of Podocarpus Totara with Bacteria, i.t. — infection threads, 
n = nucleus of host cell, w = water-storage cell, x 730. 
PLATE LXXX. 
Fig. 17. Transverse section of the root nodule of Podocarpus elongata. x 120. 
Fig. 18. Longitudinal section of the root nodule of Saxegothaea conspicua, showing the branching 
of the meristematic zone. c = cortex formed last year, a = tissue formed the first year, st= stele, 
m.z. — meristematic zone, h — hair, x 120. 
Fig. 19. Longitudinal section of the root nodule of Saxegothaea conspicua , showing two new 
nodules produced as the result of the branching of the meristem formed in the original nodule. 
n = cortex of the new nodule, st = stele, a = old nodular tissue being cast off. x 120. 
