ULODENDRON AND HALONIA 



171 



not always an obvious one. As a rule the appendages 

 of Ulodendron were distichously arranged, while those 

 of Halonia were multiseriate, and quincuncially dis- 

 posed. Williamson, however, described a specimen with 



Fig. b§.—Lepido£kloios fuliginosus. Transverse section of a young shoot (probably in 

 the Halonial condition) ; a, pith, a, xylem, of main stele ; a", xylem of branch ; i>, V \ 

 phloem of main and branch steles ; c, leaf-traces ; d, inner cortex ; e, middle cortex ; f, 

 periderm ; g, leaf-bases ; /, ligule. X about 2. After Williamson, Phil. Trans. 

 Will. Coll. 379. 



multiseriate, quincuncially arranged scars apparently of 

 the Ulodendron character, and also a Halonia with the 

 tubercles in two series, so this distinction loses its value. 1 



1 Williamson, xix. Plate vi. Figs. 22 and 25, A. 



