ENDOSPORE/E. [PHYSARUM. 



KEY TO THE SPECIES OF PHYSARUM. 



A. Sporangia stalked (occasional sessile forms) : 

 A. Stalks charged with lime throughout 



a. Capillitium lax 



Stalk white, sporangia grey, lime-knots large, 

 white. 1. P. leucopus 



Stalk white, sporangia tawny yellow, lime-knots 

 large, white. 8. P. melleum 



Stalk and sporangium yellow-olive. 7. P. variabile 



b. Capillitium rigid, persistent 



Stalk white or brownish, sporangium white, liine- 

 knots small, white. 2. P. globuliferum 



Stalk, sporangium, and lime-knots red. 



3. P. pulchripes 



Stalk, sporangium, and lime-knots mouse-brown. 



4. P. murinum 



Stalk, sporangium, and lime-knots purple. 



5. P. pulcherrimum 



Stalk, sporangium, and lime-knots yellow ; robust. 



6. P. citrinum 



Stalk, sporangium, and lime-knots straw-coloured ; 

 slender. 9. P. tenerum 



Stalk and sporangium white, Capillitium with a 

 central ball of lime. 10. P. compactum 



B. Stalks without lime or with deposits in the wall only 



a. Lime-knots purple-red, sporangium rose-red. 



11. P. roseum 



b. Lime-knots and sporangia violet-purple. 



12. P. Newtoni 



c. Lime-knots orange, sporangium mottled, blue and 



red 13. P. psittacinum 



d. Lime-knots yellow or orange, sporangium grey or 



yellow- 

 Sporangia subglobose, Capillitium lax, lime-knots 

 fusiform. 14. P. viride 



Sporangia undulate, Capillitium lax, lime-knots 

 fusiform. 16. P. polymorphum 



Sporangia subglobose, Capillitium subrigid, per- 

 sistent, lime-knots angular. 15. P. Berkeley i 



Stalk penetrating the sporangium to four-fifths its 

 height. 18. P. penetrate 



