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PLANT MORPHOLOGY 



Fig. 149. Development of the embryo of Fossomhronia cristula. A, two-celled embryo 

 within calyptra, X350; B and C, later stages, X350; D, older embryo within caljptra, 

 showing the foot, seta, and capsule with sporogenous tissue differentiated, X250; E, two 

 spore mother cells, X500; F, a spore tetrad, X500. (After Haupt.) 



A B 



Fig. 150. Longitudinal section of the capsule of Riccardia {A), with apical elaterophore, 

 and oiPellia {B), with basal elaterophore; A, X40; B, X 28. 



