62 THE MYCETOZOA 



SUB-COHORT A. 'CALCARINEAE. 

 Sporangia provided with lime. 



ORDER 1. Physaraceae. 



Lime in minute, round granules. 



A. Capillitium a coarse network charged with lime throughout. 

 Genus Badhamia, Berk. (Figs. 9 and 10). 



B. Capillitium a delicate network of threads with vesicular 

 expansions tilled with lime-granules ( = lime-knots), a. Sporangia com- 

 bined into a convolute aethalium. Genus Fuligo, Haller (Fig. 16). 

 P. Sporangia single, scattered, or aggregated, a, sporangium wall 

 membranous. Genera Physarum, Pers. (Fig. 13, a). Sporangia sub- 

 globose or in the form of plasmodiocarps. Physarella, Peck. Sporangia 

 tubular. 6, sporangium wall cartilaginous throughout, or at the base 

 only. Genera Cienkowskia, Rost. Sporangia in the form of plasmodio- 

 carps ; capillitium with free hooked branches. Craterium, Trent (Fig. 

 13, d). Sporangia goblet - shaped or subglobose. Leocarpus, Link. 

 Sporangia ovoid, glossy. 



C. Capillitium without lime -knots. Genera Chondrioderma, Rost. 

 (Fig. 13, ). Sporangium wall of two layers, more or less combined. 

 Trichamphora, Jungh. Sporangium wall of one layer, fragile ; sporangia 

 saucer-shaped. 



D. Lime confined to the stalk and columella ; sporangium wall 

 membranous. Genus Diachaea, Fries. 



ORDER 2. Didymiaceae. 



Lime deposited in the form of crystals or crystalline discs on the 

 outer surface of the sporangium wall ; capillitium without lime -knots. 

 Genera Didymium, Schrader (Fig. 17). Lime in crystals; sporangia 

 simple. Spumaria, Pers. (Fig. 13, g). Lime in crystals ; sporangia united 

 into an aethalium. Lepidoderrna, de Bary. Lime in crystalline discs 

 (Fig. 13, h) sporangia simple. 



SUB-COHORT B. AMAUROCHAETINEAE. 



Sporangia without deposits of lime ; capillitium dark brown or violet 

 brown. 



ORDER 1. Stemonitaceae. 



Sporangia stalked, the stalk extending within the sporangium as a 

 columella ; sporangium wall a single delicate membrane, often evanescent. 

 Genera Stemonitis, Gleditsch (Fig. 14, a-e). Sporangium wall evanescent; 

 capillitium springing from all parts of the elongated columella, its ultimate 

 branches forming a superficial net. Comatricha, Preuss. Like Stemonitis, 

 but the branches of the capillitium not forming a superficial net. Ener- 

 thenema, Bowman. Sporangium wall evanescent ; columella reaching to 

 the apex of the sporangium, where it forms a superficial expansion from 

 which the capillitium springs. Lamproderma, Rost. Sporangium wall 

 somewhat persistent, columella about half the height of the sporangium. 



