LYGINODENDRON 369 



spinous outgrowths, just as the young parts of recent 

 Ferns are covered with the ramenta. 



In addition to the spines, glandular outgrowths, 

 apparently homologous with them, also occur, and in 

 some forms of the plant are extremely abundant on 

 stem, rachis, and leaflets. These organs, as we shall 



Lt 



Li 





mm 







Fig. 135. — Lyginodendron oldkamimti. Transverse section of a very young stem, at the 

 commencement of secondary growth, x, one of the six primary xylem - strands 

 surrounding the pith, which is not preserved ; .r-, narrow zone of secondary wood ; 

 l.t., leaf-trace bundles; c, outer cortex ; pet, hase of petiole. x n. Will. Coll. 

 1 144 D. (G. T. G.) 



see, have played an even more important part than the 

 spines in the advancement of our knowledge of the 

 plant, for it was by means of the glands that the 

 seeds of Lyginodendron were first identified (see p. 388). 

 The glands are sometimes sessile, but more usually 

 rested on a stout multicellular stalk, the actual gland 

 consisting of a more or less spherical head, which is 











