KINGSLEY: SPLITTING OF RHIZOME OF DELPHINIUM 317 
G. 6. Cross section of rhizome in fourth year, showing separate columns cut 
off each with separate periderm, endodermis, cambium, etc. Center of section 
shows necrotic parenchyma tissue and oe xylem ducts of first year. 
Second year xylem enclosed in irregular parenchyma that eventually dis- 
integrates. Large air cavities in among kick cells of cortex. 
IG. Detail of column as indicated in Fic. 6, showing irregular parenchyma 
and second year xylem, endodermis and parenchyma cells of inner endodermis, and 
oe cells of third year xylem. 
Fic. ross section of ultimate division (root). Diarch order with second 
year Ss bundles omen connected by cambium ring. Axial strand in 
odermis like 
ie section of ee year root. Xylem of first year cut out by inner 
and outer endodermis, becomes necrotic. Groove marks first break in root. Peri- 
derm formed as in shoot 
Fic. 10. Detail of endodermis of third year rhizome. 
Fic. 3-10 inclusive (except 7) magnified about 8 diameters. Fic. 7 magnified 
38 in 
oe drawings made with Edinger apparatus, Leitz oc. I, obj. 1a; FIG. 7, 
dc, 1, a. 
KEY 
ro) gegevens Se TE air cavities Esser ioe aaa ae phlo 
CEOS eae cambiu DO BOS a sk parenchyma 
ORS / BMS ea, Bh: cortical vac Py es es periderm 
PNET errs her GHOGHEEMS ay hr et tg Beaicwun sees stereome 
of 1 BUR Re GEC epidermis Bore ees sina xylem; x:—xylem of first 
CORE Oa ae inner endodermis year, etc 
Wii is sien ee necrotic tissue cd be a ears Oe gia xylem duct 
