119 



RICCIA: 



Fig. 241. Riccia beyrichiana; main figure: distal face, surface and optical 

 section (left); proximal face, surface (right; x 1000); a, laesura (?); b, spore 

 in lateral view (x 250); c, outline of sclerine stratification (without attempt 

 to classify the layers); d, spore margin (optical section); x-y, approximate 



limit between distal and proximal face. 



