206 Gibson . — Anatomy of the Genus Selaginella. 
Figs. 83-89. Successive sections illustrating the fusion of steles at the base of 
erect shoot. The primary steles are indicated by the numbers 1-4. 
Figs. 90-92. Sections of the rhizome showing mode of origin of lateral shoot. 
Fig. 93. Transverse section of the stele of the rhizome. (Letters b-m , as i 
Fig. 76, PI. XI). n, central parenchyma ; 0, ridge of metaxylem afterwards 
isolated. 
Fig. 94. Cuticle, epidermis, and outer cortex in transverse section ( x 350). 
Figs. 95 & 1 12. S. Wallichii , Spr. 
Fig. 95. Surface view of epidermis ( X550). 
Fig. 1 1 2. Cortical cells in long. sect, (x 350). 
Fig. 96. S. caulescens, Spr. 
Surface view of epidermis ( X550). 
Figs. 97-105, 113-114. S. Braunii , Bak. (all X550). 
Fig. 97. Transverse section of protophloem-elements. 
Figs. 98, 99. Sieve-tubes in longitudinal section. 
Fig. 100. Sieve-tubes in transverse section. 
Figs. 101-105, 1 1 3. Tracheides. 
Fig. 1 14. Protophloem-elements. 
Figs. 106, 107. iS". lepidophylla , Spr. 
Cortical cells in transverse section ( x 550). 
Figs. 108-110. S. sulcata , Spr. 
Figs. 108-109. Tracheides ( x 550). 
Fig. no. L. S. stele, a , tracheides; b, phloem-parenchyma; c , sieve-tubes; 
d, pericycle ( x 550). 
Fig. in. S. oregana } Eat. 
Tracheae ( X550). 
