A .—Cross section through a small vascular group of a leaf. X 890 
n.— Cross section through a small vascular group of the leaf sheath. The large-celled 
sheath around the bundle corresponds to the sheath in Figure A, but the 
chloroplasts are wanting. The phloem is well developed, the xylem consists 
of few spiral elements; a protoxylem lacuna is wanting. X 970 
