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A TEXTBOOK OF THEORETICAL BOTANY 



Apothecia 



Fig. 355. — Xanthoria parietina. Thallus growing 

 on rock showing apothecia. Natural size. 



I 



Fig. 356. — Peltigera cauina. Habit of growth. The 

 upper figure shows the veining on the underside 

 of the thallus. The lower figure shows rolled 

 apothecial lobes protruding from the margins. 



