156 Boeshore — The Morphological Continuity of 



vex cells, forming a low dome amongst the epidermal cells. The 

 writer examined scales of L japonica and found similar struc- 

 tures projecting into the cavities of the scale. The cells of the 

 epidermal tissues are from 4- to 6-sided and regular in outline. 

 Stomata are either absent or present in small numbers; struc- 

 tures were found that had much the appearance of stomata, but 

 no accurate statement regarding them could be made. 



In the genus Orobanche (Plate XIII, Fig. 15) the vegetative 

 axis is an inch and a half or less in length. If the rhizome of 

 Lathraea be thought of as shortened and as a consequence the 

 axis became tuberous and enlarged, the condition of affairs in 

 Orobanche would be reached in which the stem axis is a short- 

 ened but enlarged tuber, covered densely with crowded scales. 

 These are more elongated than the scales of Lathraea, e. g., 

 in 0. minor, broad oval at the base and lanceolate in their upper 

 part; along the flowering axis they are lanceolate. 



In 0. cruenta the stem is exceptionally broad, measuring three- 

 fourths of an inch across. 



In transverse sections of the stem of 0. minor their outline 

 is found to be very irregular, which is due to some extent to the 

 scales given off at different levels. There is however, irregular- 

 ity also due to grooves and rather wide ridges, which become 

 greater in number and more pronounced on the floral axis. 

 Such sections show sections of the scales, as well, from whose 

 outer surface are given off the glandular hairs, which agree in 

 description with the hairs of Harveya. From 3 to 5 cells form 

 a stalk with the capitate part of the hair of 2 to 4 cells. The 

 cortex is unmodified, consisting of large thin-walled cells which 

 are packed with starch grains. The bundle system consists of 

 bundles arranged in an irregular manner about the pith area; 

 phloem is next to the cortex and xylem next to the pith. The 

 pith area is large and like the cortex has considerable starch in 

 its cells. 



Transverse sections of the flowering axis of 0. coerulea show 

 the irregularity in outline mentioned above to the greatest de- 

 gree. The epidermal cells have heavy outer walls. The hairs 

 are of the same type as for Harveya and 0. minor, and are 

 quite numerous. The cortex cells are thin-walled and have less 

 starch than those of the stem cortex. The bundle system tends 

 to become more loose and open than in the previous genera and 



