RETIOULARIACEAE 



195 



Fig. 41. — Dictydiaethalium plumbeum Rost. 



a. Aethalium. Natural size. 



b. Eight sporangia of an aethalium isolated ; in 



three the column of spores has fallen away, 

 leaving the cap and persistent threads. Mag- 

 nified 20 times. 



Fig. 41. 



Walls of convoluted sporangia perforated and forming 

 a uniform tissue of interarching bands. 



(34) Enteridium. 



Fig. 42. — Enteridium olivaceum Ehrenb. 

 a. Plasmodiocarp. Magnified twice. 

 '6. Part of spurious capillitium. Magnified 35 times. 



c. A spore cluster, and one isolated spore. Mag- 

 nified 210 times. 



Fig. 42. 



Walls of convoluted sporangia incomplete, forming strands 

 and folds with numerous anastomosing threads. 



(35) Reticularia. 



Fig. 43. — Reticularia Lycoperdon Bull, 

 o. Aethalium. Natural size. 

 6. Fragment of capillitium. Magnified 100 times. 



Fig. 43. 



B. Sporangia subglobose, closely compacted ; inner walls 

 usually complete. (36) Liceopsis. 



Fig. 44. Liceopsis lobata Torrend. 



a. Two groups of sporangia. Magnified 5 times. 



b. Capillitium. Magnified 50 times. 



c. Spore. Magnified 450 times. 



Fig. 44. 



