328 SELECTED NoTKS FUU.^F 



EXPLANATION OF PLATES X., XL, XIL, XllL 



Plate X. 



Upper Portion. 



Illustrations of Callithamniou rosenm. 



Fig. 1. — The plant slightly magnified. x 10. 



,, 2. — Branch more highly magnified, with favella? (f), x 50. 



,, 3, — Portion of main stem, with recurrent branches (/■. b, r. b), 

 X 100. 



,, 4. — Favella, with tetraspore, x 200. 



,, 5. — Spores in a '* ceramidium," or spore conceptacle, x 200. 



,, 0. — Illustrates the origin of fruits by special modification of 

 stunted branches, x 100. 



Lower Portion. 



Illustrations of Glandular Hairs on Sweet Briar leaf. 



Fig. 1. — Portion of leaf showing upper surface, which is without 

 glandular hairs, which are to be seen abundantly projecting 

 round the edge. 



2. — Lower surface, this is seen to possess scattered glandular 

 hairs, x 5. 



3, 4, 5, are more enlarged figures taken from recent specimens ; 

 the soft internal secreting cells are seen highly coloured in 

 the two first, and a little cap of Otto of Rose, on the tip of 

 the hair, in figure 4, by. manipulation, this has been some- 

 what dislodged, when it was under the microscope, exactly the 

 well-known familiar semi-crystalline appearance of Otto. 

 Almost colourless hairs, as in figure 5, are to be met with 

 occasi(>nally. DraAvn by Tufi'en West. 



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Plate XL 

 Upper Portion. 

 Illustrations of Scalariform Ducts in Backen {Pteris aquilina). 

 Fig. 1. — Portion of bundle, x 20. 



2. — Large duct, with numerous elongated pores, x 250. 

 3. — Duct, with shorter pores, on one part elongate, so as to 

 include two and even three of the first pores, x 250. 



4.— Typical ladder-like, or Scalariform duct, x 250. 



5. — Is specially given to show the thickness of the walls, and pro- 

 jections of the " bars " in section, x 250. 



0. — Transverse view of bracken-stem, to show position of the ducts, 

 which are surrounded and firmly embraced by thick walled 

 pleurenchymatous tissue, x 2. 



Louver Portion. 

 Illustrations of disc of Ophiocoma. 

 Fig. 1. — View from above. 

 ,, 2. — View from beneath, showing mouth aperture, teeth, and 

 l)lates, on which the latter work ('' jaws "). 



Drawn by Tull'en West. 





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