8 



MYXOMYCETES. 



41. Capillitium of delicate tubes filled with air, 



their walls not thickened 



42. Capillitium without thickenings, often 



sparsely developed ; frequent deposits of 

 lime in the walls ; sporangia always sim- 

 ple (Perichcenacece) .... 



Thickenings of Capillitium in the shape of 

 warts, spines, rings, half rings, or reticula- 

 tions, the sporangia covered -with a thick 

 bark ; ^Ethalium without deposits of lime 

 (Arcyriacece) ..... 



Thickenings of Capillitium in the form of 

 spirals turned to the right ; sporangia single, 

 without deposits of lime (Trichiacece] 



43. Wall double, net of Capillitium grown to its 



inner upper part ..... 



44. Sporangia single ..... 

 JEthalium, with its sporangia combined into 



a plait ; the outer sporangia of this plait 

 form a thick double bark, covered on the 

 outside with small coloured cells 



45. Capillitium of single tubes 

 Capillitium combined into a net . 



46. Surface of sporangia covered with small 



coloured cells 

 Surface of sporangia, without coloured cells 



47. Net of capillitiuni grown uniformly to the 



whole area of the walls of the sporangia 

 Only the ends of the net of the capillitiuni 

 grown to the cyathiform widenings of the 

 stem, or sunk in the midst of its contents 

 Net of Capillitium quite free 



48. Capillitiuni formed of numerous simple free 



threads ....... 



Capillitium combined into a net . 



Reticularia. 



43 



44 



48 



Peri 'dice na. 

 45 



Lycogala. 

 Oligonema. 

 46 



47 



Lachnololus. 



Arcyria. 

 Cornuvia. 



Tricliia. 

 Hemiarcyria. 



SUPPLEMENTARY ANALYTICAL KEY FOR THE 

 DETERMINATION OF GENE HA WITH 



^ETHALIA. 



1. Spores simple, globose .... 2 



Spores with a segment cut off, collected in 

 groups of from four to twenty-two in 

 number . Enteridium. 



