330 



STRUCTURE AND LIFE HISTORIES 



Fig 238.— A lichen, Parmelia perlata (L.) Ach. i. Plant, slightly 

 reduced in size; a, apothecia; b, lobe of thallus; c, soredial patches. The 

 fI\AtZ^7^^^^fT ^^P^od^f tive bodies composed of both algal and fun- 

 gal elements, and there/ore able to reproduce the lichen; the ascospores. 



