118 

 RADULA:— 



^^^ 





Fig. 238. Radiila lindbergiana; surface and optical section (lower right-hand 

 quadrant; -< 1000); exine stratification (x 2000), and LO-patterns. 



RHACOMITRIUM:— 



Fig. 239. Rhacomitriiim microcarpon. From left to right: spore in lateral view 

 (X 250); spore in polar view (-< 1000); L()-pattcrns. 



RICCARDIA:— 





Fig. 240. RiccanUn Utlifrom; spore (x 1000); exine stratification (x 2000); 



LO-patterns. 



