346 



a. 



Fig. 341. Delesseria tenuifolia Harv. 



transverse section of older leaf, b, summit of a leaf, c, a young leaf. 

 \d, middle part ot the leaf of tetrasporic plant, 

 (a, about 45:1. b, 270:1. c, 250:1. d, 120:1). 



Fig. 342. Delesseria tenuifolia Harv. 



A, part of the leaf of an antheridial plant (120:1). B, transverse section 

 of antheridial stand (270:1). C, transverse section of the midrib of the 



leaf (120:1). 



