INTRODUCTION TO BOTANY. 219 
Centrifugal, centrifuga. Directed horizontally to the 
side of the fruit. Ribes, Cucurbitace. 
Centripetal, centripeta. Directed towards the centre of 
the fruit. Cnothera, Citrus. 
CoLEORHIZE. 
Appendage to the radicle.. Coleorhiza. A fleshy sac 
enclosing the radicle like a sheath. Gramines, Cycas, 
Nymphea, Saururus, Piper. 
VITELLUS. 
i 
Any part adhering to the embryo, which is neither cotyle- 
don, nor plumule, nor radicle, not extending beyond the seed, 
and withering during germination. 
Bacillus. A fleshy part growing in the seed of hyacin- 
thus instead of the cotyledon, from which it does not seem 
to differ. 
Blastus. That part of an embryo with a large radicle 
that enlarges during germination. 
Blastophore. ‘That part that supports the blastus. This. 
is usually the vitellus of Geertner. 
Epiblastus. An anterior appendage to the blastus of 
some graminee. 
Rhiziophysis. Appendages prolonged beyond the extre— 
mities of the radicles. Nenuphar. 
TIGELLE. 
Tigella. That part of the plumule which lies between 
the collar and the gemmule. 
Visible, Tigella visililis. Apparent before germination. 
Tropheolum, Faba, Nelumbo, Damasonium Dalechampil. 
Inconspicuous, invisibilis. Scarcely developed before the 
seed germinates. Allium, Pinus. ; 
GEMMULE. 
Gemmula. The small bud that is at the end of the 
tigelle. 
Sessile, Gemmula sessilis. ‘The tigelle being inconspi- 
cuous, the gemmule appears as if seated on the collar with- 
out any tigelle. Calla Aithiopica. 
Pileolated, pileglata. Hidden under a pileole. Gra- 
mine, Scirpus. 
