390 STUDIES IN FOSSIL BOTANY 



rachis and leaflet, respectively, in the vegetative foliage 

 of Lyginodendron. Thus all the evidence goes to show 

 that the pedicel and cupule were of a foliar nature. 



The seed itself is orthotropous, and, broadly speaking, 

 of a Cycadean type ; it shows perfect radial symmetry 



— B 



Fig. 148. — Lagenostoma Lomaxi. Diagram of seed in median longitudinal section, c, 

 cupule ; v.b., vascular bundles of pedicel, cupule, and integument ; cp, canopy of 

 integument ; pc, cavity of pollen-chamber ; cc, central column ; ape, orifice. A, 

 B, C, D, planes of the transverse sections in Fig. 149. After Oliver. 



(Fig. 149) ; the integument, which has a somewhat 

 complex structure, is single, and completely adherent 

 to the nucellus, except in the apical region (Fig. 148). 

 The central strand of the pedicel, after giving off the 

 cupular bundles, passes straight up, and becomes the 

 chalazal strand of the seed ; it is here surrounded by a 



