l68 BOTANICAL GAZETTE [February 



PLATE VII 



Actinomyces XV 



Fig. 82. — Portion of aerial mycelium: elements ai-aj and bi-bj suc- 

 cessively proliferated from branches a and b respectively. 



Fig. 83. — Sporogenous branch a with 2 secondary branches; younger 

 (aj) associated with a septum above insertion (successive type) ; older (02) not 

 set off by septum. 



Fig. 84. — Axial filament with 3 branches, bearing successively poliferated 

 elements ai-aj, as well as branch ax, latter not associated with septum in 

 primary branch above point of attachment. 



Fig. 85. — Fructification developed entirely in successive sequence, with 

 2 chains of uninucleated spores. 



Figs. 86-88. — Spores germinating with 2 germ tubes. 



Actinomyces XVI 

 Fig. 89. — ^Large fructification consisting of axial filament a-ai , with whorl 

 of 5 primary branches a2-a6, each bearing i or more secondary branches. 

 Fig. 90. — Spiral termination of sporogenous branch. 

 Fig. 91. — Old filament containing many metachromatic granules. 



PLATE VIII 



Actinomyces XVII 



Fig. 92. — Portion of aerial mycelium showing spherical structures asso- 

 ciated with septa in local distensions of sporogenous branch. 



Figs. 93, 94. — Portions of aerial mycelium, some lateral elements bearing 

 secondary branches (indicated by numerals above i) developed successively; 

 94c, unusually long fertile branch. 



Fig. 95. — Portion of aerial mycelium similar to one shown in fig. 92. 



Figs. 96-100. — Spores germinating with i or 2 germ tubes. 



Fig. loia-e. — Successive stages in development of sporogenous branch, 

 ex and cy representing either alternative or probably successive stages. 



PLATE IX 



Actinomyces XVIII 



Fig. 102. — Sporogenous branch of usual type soon after appearance of septa. 



Fig. 103. — Portion of fructification bearing aberrant fertile branches 

 without spiral terminations. 



Fig. 104. — Aerial filament with several spiral branches borne terminally. 



Fig. 105. — Chain of mature spores developed from branch of spiral type. 



Fig. 106. — Degenerate axial filament containing large vacuoles and spheri- 

 cal structures and bearing a fertile spiral branch. 



Figs. 107, 108. — Portions of aerial mycelium showing fertile hyphae of 

 spiral type. 



Figs. 109-112. — Spores germinating with i or 2 germ tubes. 



