38 



ENDOSPORE^. [PHTSARUM. 



XEY TO THE SPECIES OF PHYSARUM. 

 A. Sporangia stalked (occasional sessile forms) :— 

 A. Stalks charged with lime throughout— 



a. CapUlitium 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. Oapillitium rigid, persistent — 



Stalk white or brownish, sporangium white, lime- 

 knots small, white. 2. P. glohuliferum 

 Stalk, sporangium, and lime-knots red. 



3. P. pulchrlpes 



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 st]?aw-coloured ; 

 slender. 9. P. ienerum 



Stalk and sporangium white, capillitium with a 

 central ball of lime. 10. P. compacbum, 



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



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



W. P. rosernn 



h. Lime-knots and sporangia violet-purple. 



12. P. Newtoni 



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



red 13. P. psittacinitm 



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



yellow — 

 Sporangia subglobose, capillitium lax, lime-knots 

 fusiform. 14. P. 



Sporangia undulate, capillitium lax, Hme-knots 

 fusiform. 16. P. polymorphum 



Sporangia subglobose, capillitium subrigid, per- 

 sistent, lime-knots angular. 15. P. Berkeleyi 



Stalk penetrating the sporangium to four-fifths its 

 height. 18. P. penetrale 



