PLANTS WITHOUT FLOWERS 



123 ■ 



Fig. 77. A prothallium of a fern magnified. The small figure at the 

 top ehows the natural size. Both figures show the undersid" of the 

 plant. The archegonia are shown near the notch, below are the 

 antheridia, the round dots, and numerous hairs acting as roots. 



Lichens. 



The lessons on the muslirooms will prepare the class for 

 another group of fungi, the lichens. They are very common 



