32 DESCRIPTIVE CATALOGUE 



numerous (see text-fig. 9, #.). The wood is loosely grouped into 

 large bays or bundles, which give a waving outline to tho 

 vascular cylinder, which is farther broken by the exit of the 

 leaf-traces. 



In longitudinal section, Scott says that " the histological 

 details of both wood and bark (which have more recently been 

 minutely studied by Count Solms-Laubach in an Italian species, 

 and by Dr. Wieland in the American material) agree precisely 



px. 



Tt-xt-fig. 9. BennettHet Gihomamu, Crr. Transverse seriion of the 

 inner zones of the wood. />., pith-cells : />.r., groups of priin.-ir\ \v< od ; 

 x., secondary tracheids; m., medullary rays. 



with the corresponding structure in a recent Cycad.'' Wieland 

 (1906, p. 75), however, states that "the xylem is composed 

 mainly of scalariform tracheids. Spiral cells are present next 

 to the medulla, but are not numerous. Idioblasts are occasional. 

 No pitted tracheids have been noted, although preservation is 

 such as would presumably enable ready recognition without 

 staining, were such present in any of the several radial or 



