118 



Gates, Tetraploid Mutants and Chromosome Mechanisms. 



though smaller, were otherwise like the type. The following descrip- 

 tion of the typical adult plants is taken from my notes. 



Description: Stem leaves very large, thick, broad, crinkled, 

 prominently repand-denticulate, midribs white. Stem very stout, 

 not quite so tall as neighbouring Lamarekiana plants, but later in 

 developing. Central stem surrounded by a circle of basal suberect 

 branches arising from the rosette 17 ). Later, short lateral branches 



Fig. 1. 0. gigas, Italy. Rosette July 8. Cult. 227 / 12 I. 12. 



begin to develop from the central stem. Buds very large, early 

 ones quite green or yellowish, later ones yellowish with pale red 

 colour pattern (1 5, see above). The petals, and to a less extent 

 the sepals, are exceptionally long, so that the stigma is enclosed 

 by both, and does not project beyond the petals in the bud as 

 frequently happens in other forms. 



The following table (II), made from the measurements of four buds 

 from typical plants and several from the smaller plant (Nr. I, 4), 



17) This is erroneously stated by Miss Lutz (1912, p. 392) to be distinctive 

 of gigas, but precisely the same condition occurs not infrequently in Lamarekiana. 



