Plate 17 



PSORA RUSSELLII (TUCK.) SCHNE1D. 



tion Ihhl^LL* ^™ f thC thallUS u *' ? a P° thecium - Fig- 2, a, an apothecium; b, a por- 

 tion of the thallus Fig 3, a section through an apothecium and the underlying thallus- a the 



JmKEJi*' ^ P0 j hedum; /- * he med « n "y layer; d, the hyphal rhizoids Fig 4 a s^ct on 



e Si SSS'r&Si^k b ' thC "r' COrt , CX; C ' thC algal layer ' d > the medullary lay °r" 

 e tne n>pnal rhizoids Fig. 5, a paraphysis and an ascus. Fig. 6, free simple snores Fis 1 



about 4?Th- g \ 2 ' en ' fi arged = a ^° Ut , 8 diaine ters: fig. 3, enlarged" 300 diamTers fig 4 enlarged 

 about 42 5 diameters; figs. 5, 6, enlarged 650 diameters. From Schneider. en.arged 



