10 THE BOOK OF CHOICE FERNS. 



borne on short stalks jointed close to the base, so that their very short 

 articulation is concealed among the scales. The sori (spore masses) are disposed 

 in a continuous line or chain close to and parallel with the midrib. — Hooker^ 

 Species Filicum, iv., p. 158. Nicholson, Dictionary of Gardening, ii., p. 481. 

 Beddome, Ferns of British India, t. 265. 



O. Welwitschii — Wel-wit'-schi-i (Dr. Welwitsch's). This is a variety 

 of 0. articulata. 



i^^H=e- 



OLFERSIA— Ol-fer'-si-a. See Acrostichum. 



