HoLLOWAT. — Studies in the New Zealand Species of LvcoiDodium. 173 



forms of L. varium. At the base of the stem the xylem and phloem 

 commonly extend across to form parallel plates. This is shown in fig. 5, 

 which represents a section of the stele of the xerophytic variety collected 

 on Browning Pass and illustrated hx Plate B, fig. 1, B. The same tendency 

 was observed in the basal region of the stem of the shade variety from Lake 

 Rotoiti. Higher up the stem in this species the arrangement is distinctly 

 radial. In the case of the shade variety collected from a woody gully in 

 the neighbourhood of Cass the centre of the stele in the lower part of the 

 stem was occupied by an island of phloem, as is shown in fig. 6. Fig. 85 



Fig. 5. — Lycopodiuni Selago. Transverse section of stele near base of stem of the 



xerophytic Browning Pass variety. X 137. 

 Fig. 6. — L. Selago. Transverse section of stele towards base of stem of the mesophytic 



Cass variety. x 1 37. 

 Fig. 7. — L. Billardieri. Transverse section of stele towards lower unbranched region 



of stem of the typical epiphytic form. x 90. 

 Fig. 8. — L. Billardieri var. gracile. Transverse section of stele towards lower region of 



stem. X 137. 



in Part I of these Studies illustrates the stele of the same material. Higher 

 up the same stem it was found that sometimes the xylem and at others the 

 phloem bands are joined up at the centre, there being thus a tendency 

 towards the temporary formation of one or two more or less jjarallel plates 

 of vascular tissue. Both xylem and phloem bands and groups are typically 

 massive. The cortex is differentiated into three zones, the outer being 



