PHYSARACEAE 



27 



KEY TO THE GENERA OF PHYSARACEAE. 



A. Capillitium a coarse network charged with lime 

 throughout. (2) Badhamia. 



Fig. 10. — Badhamia utricularis Berk. 



a. Cluster of sporangia. Magnified 3\ times. 



b. Fragment of capillitium and spore-cluster. Magnified 



140 times. 



Fig. 10. 



B. Capillitium a network of slender threads with vesicular 

 expansions filled with lime-granules (lime-knots). 



a. Sporangia combined into a convolute aetkalium. 



(4) Fuligo. 



Fig. 11. — Fuligo septic^ Gmel. 



a. Aethalium. One-third natural size. 



b. Capillitium threads with lime-knots and two spores. 



Magnified 120 times. 



Fig. 11. 



b. Sporangia single, scattered or aggregated. 

 Sporangia subglobose, lenticular, or in the form of plasmo- 

 diocarps ; capilhtium without free hooked branches. 



(3) Physartjm. 



Fig. 12. — Physarum nutans Pers. 

 a. Two sporangia. Magnified 9 times. 

 6. Capilhtium threads, with lime-knots, attached to a 



fragment of the sporangium-wall. Magnified 110 



times. 



Fis. 12. 



Sporangia long, cylindrical, branching ; capilhtium a close 



elastic network, with minute lime-knots 



Fig. 13. — Erionema aureum Penzig. 



a. Cluster of sporangia. Magnified 6 times. 



b. Capillitium and spores. Magnified 140 times. 



(5) Erionema, 



Fig. 13 



