72 



INTRODUCTION TO CRYPTOGAMIC BOTANY. 



forms which claim a place in this grand class. If the simplest 

 cellular algjB, as for example, Scenedesmus ohliquus (Fig. 16, a), 



Fig 16. 



a. Scenedesmus ohliquus, Klitz, magnified from specimens gcathered at 

 King's Cliflfe. 



h. Lessonia fuscescens, Bory., reduced from Dr. Hooker's figure in 

 Flora Antarctica. 



be compared with Lessonia (Fig. 16, b), or Macroeystis ; a 

 Gymnosporium (Fig. 17, a), with an Agaric or Cordyceps 

 (Fig. 1 7, 6) ; or finally the Leprarioid Sporidesmium (Fig. 1 8, a) 



