Holm. — On Obolaria virginica. 
383 
EXPLANATION OF FIGURES IN PLATE XIX. 
Illustrating Mr. Holm’s paper on Obolaria virginica. 
(The letters in the Figures indicate as follows: B , Bark-parenchyma; Ca , 
Cambium ; End , Endodermis ; Ep , Epidermis ; H, Hadrome ; Hyp , Hypoderm ; 
L, Leptome ; M, Mesophyll ; P, Pith ; P. H, Protohadrome ; Pr, Pericambium ; 
V, Vessels.) 
Fig. 1. One of the papilliferous scales from the corolla, x 65. 
Fig. 2. Stoma from the superior face of a stem-deaf. X440. 
Figs. 3 and 4. Two stomata from the inferior face of a stem-leaf; these were 
taken from that part of the epidermis which covers the veins, x 440. 
Fig. 5. Transverse section of a stem-leaf. Some of the epidermal cells contain 
anthocyan (drawn with dots in the Figure), and the mesophyll forms a uniform 
tissue without being differentiated into any special palisade or pneumatic tissue. 
X440. 
Fig. 6. Glandular hair from the axil of one of the stem-leaves. x 440. 
Fig. 7. Epidermis of the stem. X440. 
Fig. 8. Stoma from the stem, x 440. 
Figs. 9, 10 and 11. Transverse sections of the stem, showing the epidermis and 
a part of the bark (Fig. 9), the endodermis, a group of leptome, a part of the 
hadrome (Fig. 10), two groups of the inner leptome, and a part of the pith 
(Fig. 11). X440. 
Fig. 12. A very small group of the inner leptome imbedded in the pith- X440. 
Fig. 13. Transverse section of a young root, showing a part of the inner layers 
of the bark, the endodermis, the pericambium, the leptome and hadrome. x 440. 
Fig. 14. Transverse section of a full-grown root, showing the inner layers 
of the bark-parenchyma, of which two cells show glomerules of fungus-hyphae. 
The endodermis and the pericambium show numerous tangential and radial 
divisions. Between the leptome and hadrome is a great mass of cambial tissue, 
x 44°* 
Figs. 15 and 16. Two cells of the endodermis of a full-grown root showing 
radial and tangential divisions, x 440. 
