EXPLANATION OF PLATE IV 



Physarum rubiginosum Fr. 



Figs. 51, 52. Habit, X 10; spores, X 1200. 



Physarum digitatum Farquh. & G. List. 



Figs. 53, 54. Habit, X 10; spore, X 1200. 



Physarum bitedum List. 



Figs. 55, 56. Habit, X 10; spore, X 1200. 



Physarum bivalve Pers. 



Figs. 57, 58, 59. Habit, X 10; section of a sporangium, X 30; spore, X 1200. 



Physarum didcrma Rost. 



Figs. 60, 61. Habit, X 10: spore, X 1200. 



Physarum alpinum G. List. 



Figs. 62, 63. Habit, X 10; spore, X 1200. 



Physarum galbeum Wing. 

 Fig. 64. Spore, X 1200. 



Physarum penetrale Rex 



Figs. 65, 66, 67. Habit, X 12; section of a sporangium, X 30; spore, X 1200. 



Physarum melleum (Berk. & Br.) Massee 



Figs. 68, 69, 70, 71. Habit, X 10; section of a sporangium, X 24; capillitium, X 250; 

 spore, X 1200. 



