CRYPTOGAMS 



245 



Make a note of the kind of tree on which they are found 

 growing, and if possible secure a portion of the bark and 

 wood at the point where the fungus is attached. 



In general three types of shelf fungus will be found. Their 

 chief difference will be the character of the under surface. 

 In some this surface will 

 be found covered with 

 minute pores, in others 

 there will be a beautifully 

 corrugated surface, and 

 in the third class this 

 region will be found cov- 

 ered with teeth or points. 



Method. Study the 

 specimen and determine 

 its color, feel, and texture. 

 Draw upper and under 

 aspects. Answer the fol- 

 lowing questions : On 

 what tree did the speci- 

 men grow ? What are its 

 color, texture, and smell? 

 Is there any way by which its age can be determined ? Is 

 there any system about the arrangement of the ridges, pores, 

 or teeth on its spore -bearing surface? 



Cut a specimen from upper to under surface. How far 

 do the pores extend ? Draw a portion of the section. Does 

 the fungus grow continuously or by seasons? Give reasons 

 for your answer. 



Examine the base where the fungus is attached and see 

 if you can find any roots or other connection with the tree. 

 Examine some of the wood and also a specimen of sound 



FIG. 107. Shelf fungi. 

 (Photographed by W. C. Barbour.) 



