MR. G. MAW ON THE LIFE-HISTORY OF A CROCUS. 351 
fragment is often sufficient for the determination of a species, 
and always constructed on a plan bearing on the economy of the 
plant-life. 
I will merely refer to four or five of the more general types of 
structure of the tunics. 
In addition to the main tunic, which is the expanded base of 
the foliage, there is a small tunic on the very apex of the corm 
which I have termed the cap: it merely differs from the main 
tunic in its size, and in its upward development into leaves being 
arrested. The basal tunie differs essentially from the upper 
tunies inasmuch as all the points of growth are united at the 
base, resulting in a single organ adhering to the bottom of the 
corm. 
| | | | 
“h di d 
Ed N 
rM S OG 
Dat, 
doe 
ya 
NN 
A A 
\ d MA 
} 
Corm-tunies of Crocus. 
A. C. Sieberi. B. C. Pallasii. O. C. serotinus. D. C. carpetanus. 
i: E. C. versicolor. F. C. Fleischeri. 
The tunies of the great majority of the species consist of a 
fibrous skeleton on a membranous base, presenting a variety of 
pattern, and every gradation between parallel unbranched fibres 
and reticulated fibre, some of which are represented in figures 
LINN. JOURN.—BOTANY, VOL. XIX. Zo 
