physarumJ physaraceae 43 



Sporangia subglobose ; stalks brown and short, or 

 absent; lime-knots large and branching. 



24. P. auriscalpium 



Sporangia subglobose, pale yellow; stalks when 

 present membranous. 25. P. fulvum 



Stalk penetrating the sporangium for four-fifths of its 

 height. 26. P. penetrate 



£. Lime-knots white, sporangia yellow or brown — 



Sporangia subglobose, yellow, rugose ; stalks red. 



27. P. citrinellum 



Sporangia subglobose, pale yellow ; stalks flesh- 

 coloured. 28. P. carneum 



Sporangia brown, smooth, shining ; stalks when 

 present red. 29. P. brunneolum 



i). Lime-knots white ; sporangia grey or white — 



* Stalk free from refuse matter — 



Stalk straw-coloured ; sporangia globose ; capilli- 

 tium with a central ball of lime. 30. P. nucleatum 



Stalk straw-coloured, slender ; sporangia compressed ; 

 spores marked with patches of warts. 



31. P. straminipes 



Stalk red-brown ; sporangia globose, white 



32. P. pusillum 



Stalk white, membranous, short or absent ; sporangia 

 ovoid, or subglobose (and then sessile), without 

 pseudo-columella. 33. P. didermoides 



** Stalk containing refuse matter — 



Stalk buff, black, or white ; sporangia subglobose ; 

 spores brownish- violet. 34. P. nutans 



Stalk white or yellowish, sporangia discoid, often 

 umbilicate above, spores brownish- violet. 



35. P. javanicum 



Stalk black, or black below, white above; sporangia 

 ovoid or subglobose, usually with a long columella. 



36. P. crateriforme 



Stalk black, buff, or white, stout ; sporangia com- 

 pressed, lime-knots rounded ; spores dark purple- 

 brown. 37. P. compressum 



Stalk brown or white ; sporangia subglobose ; 

 lime-knots angular ; spores dark purple-brown. 



38. P. connatum 



