198 



REPRODUCTION 



a tissue filling the whole interior. Each cell of this tissue that borders on 

 a cavity may bud off a spermatium either directly or from the end of a 

 short process. 



The most important contributions on the subject of spermogonia in 

 recent years are those of Gluck 1 and Steiner 2 . Gliick, who insisted on the 



Fig. 1 13 A. Types of lichen " sporophores " and pycnidiospores. i, 

 Peltigera rufescens Hoffm. x 910; 2, Lecidea (Psora) testacea Ach. 

 x 1200; 3, Cladonia cariosa Spreng. x 1000; 4, Pyrenula nitida 

 Ach. x 1130; 5, Parmelia tristis Nyl. x 700; 6, Lobaria pulmo- 

 naria Hoffm. x 1000 (after Gliick). 



1 GlUck 1899. a Steiner 1901. 



