SYNOPSIS OF MYCETOZOA 185 



Plasmodiocarps flat ; columella brownish flesh-coloured 



0. reticulatum Host. 



Sporangia hemispherical; columella white, convex; inner 

 sporangium-wall rarely persistent ; spores violet- 

 brown, 7-10 ^ . . . . C. spumarioides Eost. 



Sporangia subglobose ; columella small, convex, white ; 

 inner sporangium-wall persistent, colourless ; spores 

 purplish brown, 11-14 ft . . C. globosum Kost. 



Sporangia subglobose or ovoid (or forming plasmodiocarps 

 in var. deplanatum); columella subglobose or clavate, 

 orange, red-brown, or pale, absent in plasmodiocarp 

 forms ; inner wall persistent, orange below ; spores 

 purplish brown, 9-14 fi . % . . C. niveum Eost. 



(including C. Lyallii Mass.).f 



b. Sporangia flesh-coloured, depressed C. testaceum Eost. 



c. Sporangia reddish clay -coloured or brownish buff, wall 



single ... C. simplex Schroet. (15, p. 85*). 



Subgenus 2. Leangium. Sporangium- wall cartilaginous. 



a. Sporangium-wall brown externally, white and crystalline 



on the inner side ; columella none 



C. Trevelyani Eost. 



b. Sporangium-wall without a crystalline layer — 



a. Spores with widely scattered warts, sporangia stalked 



C. fioriforme Eost. 



b. Spores closely spinulose or nearly smooth — 



Sporangia pinkish brown, sessile, subglobose ; columella 

 indefinite; capillitium usually colourless 



C. Sauteri Eost. 



Sporangia ochraceous, sessile, subglobose or ring-shaped ; 

 columella indefinite ; capillitium purple -brown 

 C. ochraceum Schroet. (20, p. 150; & 15, p. 88). 



Sporangia brown, marked with close radiating dark lines, 

 sessile, hemispherical; columella white, prominent 



C. asteroides List. (16, p. 209*). 



Sporangia grey or pale brown ; columella pale, hemi- 

 spherical ; stalk stout, ochraceous 



C. radiatum Eost. 



Sporangia mottled brown ; columella convex, ochraceous ; 

 stalk black C. roanense Eex 



Sporangia and clavate columella white ; stalk slender, 

 black C. rugosum Eex 



Sporangia bright orange ; columella clavate ; stalk slender, 

 dark brown C. lucidum Cooke 



t Numerous alpine gatherings showing intermediate forms prove that C. 

 Lyallii cannot be regarded as move than a variety of C. niveum. 



Journal of Botany. — Vol. 45. [May, 1907.] p 



