Fie, 201. Magnified branchlets of (a) Callithamnion rosewm, (b) C. byssoidewm, (c) C. 
polyspermum, with tetraspores ; (d) the same, with favelle; (¢) C. Borreri. 
Fie, 202. (a) Magnified branchlets of C. gracillimwm, with favelle: (b) the same, with 
tetraspores; (c) C. granulatum. 
