312 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
PLATE 19. 
Fig. 88. A nigozanthos pulcherrima. Extremity of a rootlet. X 300. 
Fig. 89. A. pulcherrirna. A part of the epidermis after the appearance of the 
hairs. X 220. 
Fig. 90. Elettaria Cardamomum. Trichomic and intervening cells in profile, 
at the beginning of the growth of the hairs. X 315. 
Fig. 91. E. Cardamomum. Trichomes and hairless cells in alternation. 
X 315. 
Fig. 92. Maranta Leitzii. Superficial view of the mature epidermis. X 315. 
Fig. 93. Pogonia ophioglossoides. Trichoblast and hairless cells in profile, 6 
mm. from the apex of a rapidly growing root. 
Fig. 94. P. ophioglossoides. Base of trichome between elongated cells, in 
profile. 
Fig. 95. P. ophioglossoides. Superficial view of the epidermis showing the 
trichome. 
Fig. 96. Arethusa bulbosa. Young trichomes in surface view. X 220. 
Fig. 97. Nymphaea dentata. Radial longisection of the epidermis at the 
border of the root-cap. X 450. 
Fig. 98. N. dentata. Epidermal cells in profile, 5 cells back from those 
represented in figure 97. X 450. 
Fig. 99. N. dentata. Superficial appearance of the cells represented in 
figure 98. X 450. 
Fig. 100. N. dentata. Young trichome. X 450. 
Fig. 101. N. dentata. Partly grown trichome. X 220. 
Fig. 102. Nuphar advena. Surface of the epidermis below the zone of root- 
hairs. 
Fig. 103. Eucharis amazonica. Radial longisection through cap, epidermis, 
and exoderm, showing the origin of the exodermal transfusion 
cells. X 220. 
Fig. 104. E. amazonica. Transfusion cell of mature exoderm in profile. 
X 160. 
Fig. 105. E. amazonica. Transfusion cell in older exoderm, above which 
the epidermal cells have separated. 
Fig. 106. Hyacinthus amethystinus. Optical radial longisection of epidermis 
and exoderm at the edge of the cap, showing the origin of the 
transfusion cells (as at T). X 410. 
Fig. 107. II. amethystinus. Superficial view of the cells shown in figure 106. 
X 410. 
Fig. 108. H. amethystinus. Exodermal transfusion cells at a later stage, 
in profile. X 410. 
Fig. 109. Aspidistra lurida. Radial longisection of the exoderm beginning 
with the 31st cell from the apex. The first transfusion cell at T. 
X 300. 
Fig. 110. A. lurida. Longisection of sheath and exoderm, showing alterna¬ 
tion of long and short cells in the exoderm, 8 mm. from the apex. 
X 300. 
