﻿MR. JOHN SCOTT ON THE TREE FERNS OF BRITISH SIKKIM. 41 



fronds; dy central parenchyma; e^ fibro-vascular bundles 



the third and least-developed shoot.. Nat. size. 



lase of the frond of the same, showinsr the form and arranp-i 



Nat 



Fig. 3, Longitudinal section of the base of a young stipe, exhibiting the diaphragm (a) of the frond. 



Nat. size. 

 Longitudinal i 

 of the stem. 



others. The 



also in a division 



vigorous 



same as in the above ; /, 



to the partial decay of the young fronds; g k h have reference to the following sections. 



Nat. size. 



Fig. 5. Transverse section of the undivided caudex of the above at the point g in fig. 4, showing marked 



irregularities in the distribution of the vascular system^ and a partial lobing of the caudex, 

 indicating the commencement of the subsequent bifurcations : j, an adventitious shoot ; k, ad^ 



■ 



, ventitious roots enveloping the epidermis. The other letters correspond with the previous 

 figures. ... 



Figs. Qk7. Lower and upper surfaces of sections at the points h and i in fig. 4. Fig. G exhibits the 



\-- 



lower surface^ and shows a ternary segregation of the woody laminae, and the origin of another 

 adventitious shoot at the point Z. Fig. 7, of the upper surface, exhibits clearly the completed 



4 



ternary division, m^ horizontal woody plates continuous with the main woody framework, but 

 unprojected laterally, apparently from the derangement of the vegetative forces, consequent on 

 the trifurcation of the caudex. The other references agree with those above. All the above 

 sections are of the natural size. 



Plate VI. 



Fig. 1. External portion of a dried caudex oi Alsophila latebrosa cleared of the bases of the stipes, so as 



form of the scars in that snecies. Nat 



scars, exhibitinfir the free woodv bundles 



parts 



Nat 



Fig. 3. 



with its woody laminae^ showing below a portion of the loop of a lower 

 Dff of a marginal series of bundles, i, which pass along the periphery 

 ,phragm of the frond, exhibiting the arrangement of the free vascular bi 



e, Nat 



rhizome of Polypodium prolifi 



matous axis; ^, vascular bundles giving off branches to the fronds, c. These branches, it will 



pass off indifferently from the inosculations 



Nat 



tubers of Nephrolepis cordifolia 



vascular fibres on the main parenchymatous mass. Nat 



Neph 



ded 



knob-like bases 



Nat 



Plate VII. 



vascular bundle 



esculentum^ showing the irregul 

 ' tree ferns. Nat. size. . 



VOL. XXX. 



G 



