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



eedling of Cycas pectinata^ Griff.^ wliich also sliowSj even from 



curvature 



rachis. Nat 



Plate XIII 



_ ^ 



spinulosa^ Wall, : fig. 1. Portion of a frond^ nat. size; fig. 2. Portion of the rachises ^itli iv; 

 pinnae; fig. 3. An upper view of a portion of the rachis; fig. 4. Segments with sori, magnified 



Magnified 



Plate XIII. b. 



II F 



Alsophila latebrosa^Kodk. : fig. 1. Portion of a frond ; fig, 2. Portion of the ractis; fig. 3. Pinn« : all nat. 



size. Fig. 4. A magnified soriferons segment; fig. 5. A magnified barren segment. shoTving tie 



characteristic 



•f 



Plate XIV. 



Hemiteli 



Pmnse, nat. size ; figs. 4-7. Magnified segments exhibiting the venation and variations in 

 degree of development of the involucre; fig. 8. A magnified barren segment; figs. 9-11. 



fig. 3. 



agnified 



Plate XV. 



contaminanSy Wall., var. Brunoniajna 



unarmed lower and 



surfaces; fig. 4.. A magnified sporiferous segment; fig. 5. Portion of the strongly armed rachis 

 of Alsophla contaminans, Wall., for comparison with the unarmed rachis of the var. Bruno- 



the stipCj nat. size. 



gnified barren segment, showing the venation ; fig. 7. Pale* of the base 



and fig. 3, of two pinnae : all 



Plate XVI. A. 



r 



F 



of a frond ; fig. 2, of the rachis, showing the upper surface 



pmna 



Magnified fertile pinna ; and fig 



Plate XVI 



• 



Wall : fig. 1. portbn of a frond; fig. 2, of the rachi., showing the npner surfaces 



and fig. 3, of two pinna : all 



show 



Magnified 



A 



Plate XVII 



Portion of a frond; fig. 2, of two pinn*: nat. size. Figs 



!:S !!!r ''' ''/ /T" '^'^- *^ l^""- «^rae, showing 



howing the jointed hairs 



fig. 5. A 



Plate XVIII 



form 



Nat 



from a single plant, showing the diff'crence* 



f ^C t?,T :r^ t^^'- ^''--^ '^^ -nations in the position of the 



gs. 1 6> 2i. and 3 h M«^^fi a . ^-^xatiuus m ine position of the son; 



)ility of the venatin. ' ' ^""^ ^ ^ ^^^ magnified segments to show the 



ariability 



-X- -,. 



