in Monocotyledons ( III and IV). 
463 
Iridaceae. •* 
Crocus sp., Iris sp., Moraea polystachya Ker-Gawl., and Sisyrinchium 
sp. Since in my previous paper 1 cambium in this family was only recorded 
in one case ( Tritonia ), it may be worth while to note here its occurrence in 
the leaves of members of these four additional genera. 
Cyclanthaceae. 
Carludovica rotundifolia H. Wendl. The vascular bundles of the axis 
of this plant, in the region near the growing apex, show cambial activity 
which, though somewhat irregular, is quite well marked (Fig. 6). This case 
is of interest because there has hitherto been no record of cambium from 
this Cohort (Synanthae). 
Fig. 6. Carludovica rotundifolia H. Wendl. Transverse section of bundle from near growing 
point of axis ( x 258 circa). Fig. 7 . Sciaphila purpurea Benth. Transverse section of a bundle 
from an axis less, than 1 mm. in diameter (x 424 circa). t>x. — protoxylem ; mx. — metaxylem ; 
ph. = phloem. 
Triuridaceae. 
I have examined two species of Sciaphila , as representatives of the small 
Cohort of the Triuridales. This saprophytic genus has leaves reduced to 
little scales, and the development of the vascular tissue is correspondingly 
slight. Fig. 7 represents a bundle from the transverse section of an axis of 
Sciaphila purpurea Benth., which was less than 1 mm. in diameter. The 
arrangement of the elements may perhaps be interpreted as indicating 
a vestigial trace of cambial activity. 
Arber, A. (1918). 
