60 

 DRYOPTERIS: 



Fig. 106, Dryopteris filix-mas. 

 From left to right: proximal 

 face (optical section, x 250); 

 sclerine stratification ( x 2000); 

 equatorial, longitudinal view 

 (X 1000). 



ELAPHOGLOSSUM;— 







Fig. 107. Elapboglossiim uicillardii. From' left to right: proximal face (optical 

 section, x 250); lateral, longitudinal view (x l(j()0); sclerine stratification 



(X 2000). 



EQUISETUMr— 



Fig. 108. Eqiiisetum giganteiim. a, part 

 of sclerine of an acetolyzed spore, op- 

 tical cross-section (x 1000); amplec- 

 tators ("elaters", "hapters") dissolved; 

 b, sclerine stratification ( x 2000); c, 

 opened spore (x 250); d, part of an 

 abnormal spore tetrad (one large, three 

 small spores; x 250). 



