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PL 
Pl. 
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25. 
24. 
25. 
24. 
26. 
26. 
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, 19. 
BRANCH OF LEPIDOPHLOIOS FULIGINOSUS. 235 
. Longitudinal section through outer portion of medullary tissue (m.), showing the division 
of its elongated cells by transverse and oblique walls. The inner pith-cells on the left- 
hand side are much compressed. 
D, = scalariform tracheids of primary xylem. 
Longitudinal section of a portion of the stele in which there has been a considerable 
amount of secondary tissue formed (s./.), showing its short-celled character. 
Lt. = leaf-trace. 
ph. = phloem. 
i.c. = inner cortex. 
Dn, = primary xylem. 
Transverse section through secondary tissues (s.¢.), consisting of small square cells. 
Lettering as in fig. 11. sp., split in tissues in the region of the pericycle ; this is also 
seen in fig. 7. 
Drawing of portion of transverse section representing the outward passage of mesarch 
leaf-trace (i.¢.) through the phloem region. 
ph. = phloem partially disorganized. 
DÄ. = phloem group which will accompany leaf-trace bundle. 
c.f. = columnar tissue, possibly of meristematic nature or immediately outside 
the cambium and the secondary tissues. 
per. = pericycle, in part meristematic, on left-hand side. 
i.c. = inner cortex. 
Longitudinal view of the secretory tissue found immediately on the inside of the 
periderm. In the lower part of the drawing its mode of origin from the outer cortex 
is recognizable. 
oC, = outer cortex. 
sc. == secretory tissue. 
. Portion of a longitudinal section from Dr. Scott's cabinet (No. 796), showing the 
origin of parichnos (par.) as a continuation of the middle cortex (m.c.) accompanying 
the leaf-trace bundle (7.7.) in its course through the outer cortex (o.c.). 
Portion of a transverse section of halonial branch a little above the one represented in 
fig. 7, showing stele closed again after having given off bundle and the vascular branch 
to the tubercle running nearly horizontally through middle cortex and outer cortex. 
v.b. = vascular branch to tubercle. 
m.c. = middle cortex. 
o.c. = outer cortex. 
Tangential section through halonial stem near tubercle, showing the vascular branch 
surrounded by sheath of middle cortex (m.c.) making its way through the outer cortex 
(o.c.). 
per. — periderm. 
Drawing of portion of stele of the halonial tubercle seen in transverse section, showing 
one of the mesarch leaf-traces U fr. 1 passing outwards to the phloem (pA.). 
c.t. = columnar tissue lying between the xylem and phloem. 
More enlarged view of the stele of the halonial tubercle, showing the somewhat 
irregularly arranged tracheids of the wood surrounding the parenchymatous pith. 
