XIX] 



GAMETOPHYTE 



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Fig- 379- Ophioglossum vulgatitm. A, a prothallus seen from without ( x 30). Numerous antheridia 

 [an] and archegonia (ar) are present. (/^) is a young sporophyte with a strong primary root; 

 \ad) is an adventitious branch; [k) the dark brown hyphae of a fungus, branches of which 

 ' penetrate the prothallus. B, longitudinal section of a prothallus : {a) apex, [b) base ; at the apex 

 developing antheridia (att), and archegonia [ar)\ below are empty sex-organs: [em) a young 

 embryo, (en) the endophytic fungus occupying the lower part of the thallus. (After Bruchmann.) 



