19 ig] DRECHSLER— ACTINOMYCES 167 



Actinomyces IX 



Fig. 51. — Portion of aerial mycelium showing spiral termination con- 

 verted into chain of uninucleated spores, and presence of remnants of septa 

 in hyaline isthmuses. 



Fig. 52. — Similar to fig. 51, but without indications of septa between 

 spores. 



Fig. 53. — Portion of aerial mycelium showing septa in axial filament above 

 insertions of some sporogenous branches. 



Fig. 54. — Sporogenous branches with portion below second turn of spiral 

 conspicuously thickened. 



Fig. 55. — Sporogenous branch of 11 turns. 



Fig. 56. — Spore germinating with i germ tube. 



Fig. 57. — Sporogenous branch of 15 close spiral turns. 



Actinomyces X 

 Figs. 58-60. — Portions of aerial mycelium. 

 Figs. 61, 62. — Spores germinating with i and 2 germ tubes respectively. 



PLATE V 

 Actinomyces XI 

 Figs. 63, 64. — More or less erect fructifications terminating long prostrate 

 filaments, showing origin of groups of sporogenous branches from local hyphal 

 distensions occupied by conspicuous vacuole. 



Figs. 65, 66. — Intermediate portions of aerial mycelium. 

 Fig. 113. — Spore germinating with i germ tube. 



Actinomyces XII 



Figs. 67, 68. — Erect fructifications terminating long prostrate aerial fila- 

 ments, exhibiting a pronounced tendency toward successive type of develop- 

 ment, and showing cuneate hyphal enlargements below insertions of branches. 



Fig. 69. — Intermediate portion of aerial mycelium. 



Fig. 700-e. — Progressive stages in development of sporogenous hypha, 

 occurring in this and numerous other species. 



Fig. 71. — Spore germinating with 3 germ tubes, 



PLATE VI 



Actinomyces XIII 



Fig. 72. — Two portions, a terminal, h subterminal, of one long, unbranched, 

 continuous sporogenous hypha showing very slight spiral tendency. 

 Fig. 73. — Chain of spores with deep staining polar granules. 

 Figs. 74, 75. — Portions of aerial mycelium showing branching. 



Actinomyces XIV 

 Figs. 76-81. — Portions of aerial mycelium showing arrangement of spo- 

 rogenous branches on hyphae, and method of sporulation. 



