DEVELOPMENT OF PLANTS 



231 



Fig. 157. Sexual reproduction of one of the cup fungi, Pyronema: A, 

 the flask-shaped female gametangium, 0, is seen in various stages of fusion 

 with the male gametangium, an. B, the gametospores, g, germinating and 

 forming branching hyphae which bear the asci, as. These asci are asso- 

 ciated with hyphae or paraphyses, p, that arise from the mycelium. The 

 asci and paraphyses constitute the hymenium. — After Harper. 



.^#5: 



^ 



7mw ' t A 



Fig. 158. Common forms of the Helvellales: A, the morel, Morchella. 

 surface view at left and in section at right. The asci and paraphyses form 

 a hymenium over the honej^comib surface. B, Leotia, a small gelatinous 

 form of a light, bluish-green color. C, Geoglossum, a black tongue-like form. 

 In B and C the hymenium is confined to the upper enlarged portion of the 

 fungus. Both are common in boggy ground. 



