Physarum 



31 



Lime-knots white; sporangia yellow or brown. 

 Sporangia subglobose, rugose, yellow; stalks 



red. 

 Sporangia subglobose, pale yellow; stalks 



flesh-colored. 

 Sporangia brown, smooth, shining; stalks 

 when present red. 

 Lime-knots white; sporangia gray or white. 

 Stalks free from refuse matter. 



Stalks straw-colored; sporangia globose; 

 capillitium persistent with a central 

 ball of lime. 

 Stalks straw-colored, slender; sporangia 

 compressed; spores marked with 

 patches of warts. 

 Stalks red-brown; sporangia white, sub- 

 globose, umbilicate. 

 Stalks white, membranous, short or ab- 

 sent; sporangia obovoid or subglobose, 

 often sessile. 

 Stalks red-brown, translucent; sporangia 

 discoid or saucer-shaped. 

 Stalks containing refuse matter. 



Stalks buff, black, or white; sporangia 



subglobose; spores brownish violet. 

 Stalks white or yellowish; sporangia dis- 

 coid, often umbilicate above; spores 

 brownish violet. 

 Stalks black, or black below and white 

 above; sporangia obovoid or subglo- 

 bose, usually with a long columella; 

 spores dull lilac. 

 Stalks usually black, stout; sporangia 

 compressed, often lobed; lime-knots 

 more often rounded; spores dark pur- 

 plish brown. 

 Stalks brown or white; sporangia sub- 

 globose ; lime-knots more often angular ; 

 spores dark purple-brown. 

 ' Stalks black ; sporangia subglobose or dis- 



coid; spores dark purplish brown with 

 a paler spot. 

 Stalks 3'ellowish or dark, slender; spo- 

 rangia compressed and lobed, often 

 clustered, smaller than P. compressum. 

 Sporangia sessile, never stalked except P. auriscalpitim. 

 (For occasional sessile forms see 3, 13, 22, 23, 27, 

 29, 31, a, 36, 37.) 



25. P. citrmellum 



26. P. carneum 



27. P. brunneolum 



28. P. nucleatiim 



29. P. straminipes 



30. P. pusillum 



31. P. didermoides 



32. P. pezizoideum 



ii. P. nutans 



34. P. javunicum 



35. P. crateriforme 



36. P. compressum 



37. P. notubile 



38. P. megalosporum 



39. P. reniforme 



