THE MYCETOZOA 63 



Clastoderma, Blytt. Sporangium wall partly evanescent, persisting in the 

 form of minute discs, at the tips of the rigid capillitium threads ; columella 

 ehort or none. Echinostelium, de By. A minute colourless form with 

 long stalks and a sparsely-branched spiny capillitium. 



ORDER 2. Amaurochaetaceae. 



Sporangia combined into an aethalium ; capillitium of irregular 

 strands and threads, or complex. Genera Amaurochaete, Rost. Capil- 

 litium of irregular branching threads. Brefeldia, Rost. Capillitium of 

 horizontal threads, with many-chambered vesicles. 



COHORT II. LAMPROSPORALES. 

 Spores variously coloured, never violet. 



SUB-COHORT A. ANEMINEAE. 



Capillitium absent, or not forming a system of uniform threads except 

 in Alwisia. 



ORDER 1. Heterodermaceae. 



Sporangium wall membranous, beset with minute round granules, 

 and (except in Lindbladia) forming a net in the upper part. Genera 

 Lindbladia, Fries. Sporangia sessile, compacted or aethalioid, the wall 

 not forming a net in the upper part. Cribraria-, Pers. Sporangia stalked ; 

 sporangium wall with thickenings in the form of a delicate persistent 

 net, expanded at the nodes. Dictydium, Sclirader (Fig. 14,/). Sporangia 

 stalked ; sporangium wall with thickenings in the form of longitudinal 

 ribs connected by delicate threads. 



ORDER 2. Liceaceae. 



Sporangia solitary, sessile or stalked ; sporangium wall cartilaginous ; 

 capillitium and columella absent. Genera Licea, Schrader. Sporangia 

 sessile, globose or in the form of plasmodiocarps. Orcadella, Wingate. 

 Sporangia stalked, furnished with a lid of thinner substance. 



ORDER 3. Tubulinaceae. 



Sporangium wall membranous, without granular deposits ; sporangia 

 tubular, compacted together. Genera Tubulina, Pers. Columella 

 absent. Siphoptychium, Rost. A hollow pseudo- columella is present, 

 connected by tubular extensions with the sporangium wall. Alvrisia, 

 Berkeley and Broome. Sporangia stalked ; with tubular threads attached 

 to the base and apex of the sporangium wall. 



ORDER 4. Reticulariaceae. 



Aethalia, with the sporangium walls incomplete, perforated, and 

 forming a spurious capillitium. Genera Dictydiaethalium, Rost. 

 Sporangium walls cap -shaped above and continued down to the base 

 in four to six straight threads. Enteridium, Ehrenberg. Walls of 



