PRATT: CYCLOLOMA ATRIPLICIFOLIUM. 117 



zone; d, starch sheath; s, anomalous phloem; e', outer area of the pericycle; 

 p, anomalous xylem zone; /', bast fiber. X 330. 



Fig. 53. Portion of a cross section of stem in region V, showing varied 

 structure of the innermost anomalous xylem zone; p, anomalous xylem zone; 

 q, anomalous phloem zone; r, secondary medullary ray; s, anomalous phloem; 

 t, pericycle cells in outer part of area of tissue designated in this article as an 

 anomalous phloem zone; m", tracheal tube; n", wood parenchyma cell bor- 

 dering a tracheal tube; o", wood fiber; p", tissue of inner 20 per cent of the 

 anomalous xylem zone, composed entirely of wood fibers; q", tissue of outer 

 80 per cent of the anomalous xylem zone composed of wood parenchyma and 

 tracheae. X 225. 



Fig. 54. Longitudinal section of cells in the portion of the innermost 

 anomalous xylem zone of the stem in region V, which correspond to the cells 

 in the area, c', fig. 25, but the cells of which have lignified walls and resemble 

 pith cells in shape in cross section. X 225. 



Fig. 55. Cross section of cells of anomalous xylem (shown in longitudinal 

 section in fig. 54). X 225. 



Fig. 56. Portion of cross section of stem in region V, showing strip of 

 anomalous xylem, u, including a water tube, M", and anastomosing from one 

 anomalous xylem zone to another; p, anomalous xylem zone; q, anomalous 

 phloem zone; r, secondary medullary ray; s, anomalous phloem; t, pericycle 

 cells in outer part of tissue designated as a phloem zone in this article. X 225. 



Fig. 57. Portion of cross section of stem in region V, showing portion 

 of the innermost anomalous xylem zone having wood fibers rectangular or 

 almost square and arranged regularly in radial rows: a'", water tube. X 225. 



PLATE X. 



Fig. 58. Portion of a cross section of the stem in region V, showing g'", 

 radial row of cells, having a radial dimension two to four times as great as 

 their tangential dimension, in the anomalous xylem-phloem zones. The 

 radial row of cells consists of h'", pericycle cells, and a'", secondary medul- 

 lary ray. cells, in the anomalous phloem zones; and of j'", cells, which 

 resemble wood parenchyma in size and proportion, in the xylem zones: p, 

 anomalous xylem zone; q, zone of tissue designated in this article as an anoma- 

 lous phloem zone; r, secondary medullary ray; s, anomalous phloem; /, peri- 

 cycle cells in outer area of zone of anomalous tissue, designated in this article 

 as a phloem zone; u, radial strip of xylem anastomosing from one anomalous 

 xylem zone to another; g', radial strip of tissue anastomosing from one an- 

 omalous phloem zone to another. X 225. 



Fig. 59. Longitudinal section of a portion of pericycle tissue, located in 

 the outer part of a zone of tissue, designated as an anomalous phloem zone 

 in this article, and corresponding in location to the area of tissue, t, in cross 

 section, fig. 57. X 225. 



Fig. 60. Longitudinal section of anomalous tissue, corresponding in lo- 

 cation to the strip of anomalous tissue, in cross section in fig. 58: g'", radial 

 strip of tissue anastomosing from one anomalous phloem zone to another. 

 X 225. 



