72 ANNE M. LUTZ 
O. lata in the majority of its characters. The tendency of the margin 
of the leaves of incurvata to roll towards the upper surface of the midrib 
is one of the most striking characteristics of the full-grown rosette 
leaves of 0. albida (compare Fig. 7 with Gates's Fig. 56). 
Fig. 7. O. albida, plant No. 3472, C.S.H., 1908. Offspring of 0. Lamarckiana 
X 0. Lamarckiana. Mutant in late rosette stage showing margins of leaf blade 
rolling towards the midrib; a typical albida character. 
In view of the above facts, it is not surprising to find that a few of 
the twelve 15-chromosome types had one or two characters suggestive 
of 0. lata, just as others had one or two suggestive of 0. Lamarckiana , 
of 0. fuhrinervis or some other form; yet, since the majority of the 
characters were wholly unlike those of 0. lata in the first case and 
wholly unlike those of 0. Lamarckiana and 0. rubrinervis in the latter 
instances, the first could not be called lataAike nor the latter La- 
marckiana- or rubrinervis -like. In fact, only 2 of the 12 types were 
lata-like; namely, O. lata and O. nanella lata. On the other hand, 
2 plants {2 types) were found in Cold Spring Harbor cultures of O. La- 
marckiana, which were conspicuously Iditai-like in appearance, though 
differing from O. lata sufficiently to be regarded as distinct forms, and each 
had 16, and not 15, chromosomes. 
