﻿40 MR. JOHN SCOTT ON THE TREE FERNS OF BRITISH SIKKIM. 



the growing-point: fig. 1, upper; fig. 2, lower surface; a-fl*, fronds In differeat stages of deve- 

 lopment ; h, the incipient wbody laminae arranged on the flattened apex, indicating the points 

 of origin of future cycles of fronds^ c. Nat, size. 

 Fig. 3. Lower section of the same, showing the normal distribution of the vascular system : a, epidermal 



laver; b, adventitious roots; c, woody laminae; d, central parenchyma; e, hases of fronds in 



various stages of development. Nat. size. 



Fig. 4, Another section of the same^ with similar references, showing the derangcuncnt in the distribu- 

 tion of the vascular system caused hy the development of adventitious buds, /. In the most 

 perfectly developed bud secondary ones are observable as round protuberances of cellular 

 matter^ g. Nat. size. 



Figs. 5 & 6. Outer and inner view of the base of the stipes of the above^ showing the stipal loculi arranged 



in an intramarginal line. Nat. size. 



Plate III 



Figs- 1 & 2. 



sur 



pinnse 



locul 



Fig 



face^ with similar references, showing the enlarged 

 fibro-vascular bundles of the stipe. Nat, size. 



internal sur- 

 oculi : c. the 



bases 



b, woody laminae, showing the demarcation of the points of origin of future fronds {c c) and illus- 



organs. Nat 



vascular system 



Fig. 



4. A lateral section of the above, similarly prepared, but representing more, clearly the arrangement 



and peculiar ramifications of the vascular bundles: a, stipal loculus; b, scales of the stipes; 



apex of the axis. Nat 



near 



bundle 



with its eloneratcd free 



s 



laminae ; e, the inosculatory and ramifying bundles. Nat. size. 



frond ; d, Troody 



Plate IV. 



gs- 1, 2, & 3. Transverse sections from living- and dnV«l n%^^c^\r.c.. r.f a ^ - 



f . „ , . ^ " ^^^^^^ caudices of A. contamtnans. var. Brunontana, 



fig. 3, from a dried caudex. 



from 



I 



ri«. .. W;;;:'';^ -f ; °f ^''"Ma; S'c'Ora : a, epidermal layer ; *, adventitious roots ; ., base of 



Stipes , o, vounff rronrls • p wnr,#i-rT i„^: . ,• , . _ ' ' 



' ' ' — J ^"""-^ '-'jiii'iiiueu out into tne 1 



ff, central parenchyma. Kat. size. 



Fig. 5. Transverse section of the same, .ith similar references. Nat. size. 



/ 



; 



Plate V 



true bifa 



ginating 



rie'in of ^ 



m 



