694 ADDITIONAL EXERCISES 



Family 2. Thysarace.*:. — Lime in the form of minute round granules, innate 

 in the sporangium wall. 

 Capillitium charged with lime throughout. Badhamia. 

 Capillitium of hyaline threads with lime knots. 

 Sporangia single, subglobose, or plasmodiocarps; capillitium without free, 



hooked branches. Physarum. 

 Sporangia forming an sethalium. Fiiligo. 



Plasmodiocarps; capillitium with free, hooked branches. Cienkowskia. 

 Sporangia goblet-shaped or ovoid; stalks cartilaginous. Craterium. 

 Sporangia ovoid, shining, clustered; stalks membranous. Leocarpus. 

 Capillitium without lime. 



Sporangial wall opaque. (Chondrioderma ( = Diderma). 

 Sporangia! wall hyaline. Diachaa. 

 Family 3. DiDyMiACE.a;. — T.im p in superficial crystals deposited outside the 

 sporangial wall. 

 Crystals stellate, sporangia single. Didymium. 



Crystals stellate, sporangia forming an sethalium. Spumaria ( = Mucilago) . 

 Crystals lenticular. Lepidodarma. 

 (6) Sporangia without lime. 

 Family 4. Stemonitacke. — Sporangia single, provided with a stalk and 

 columella. 

 *Sporangial wall evanescent. 

 Capillitium spreading from the column and forming a superficial net. 



Siemonilis. 

 Capillitium as above, but not forming a superficial net. Comatricha. 

 Capillitium spreading from the apex of the sporangium. Enerthenema. 

 **Sporangial wall more or less persistent. 

 Capillitium radiating from the columella. Lamprodema. 

 Capillitium scanty, colorless, branching from a short columella, sporangia 

 very minute. Echinostelium. 

 Family 5. BrefeldiacejE. — Sporangia combined into an sthalium. 

 Capillitium irregularly branched. Amaurochate. 

 CapiUitium with chambered vesicles. Brefeldia. 

 B. Spores Tariously colored, not violet {except Cribraria violacea). 



(o) Capillitium wanting, or not forming a system of uniform threads. 

 Family 6. Cribrariaceje. — Sporangial wall membranous, beset with micro- 

 scopic round plasmodic granules. 

 Sporangia sethalioid, the wall not forming a persistent net. Lindblaiia. 

 Sporangial wall forming persistent net. Cribraria. 

 Sporangial wall forming numerous parallel ribs. Diclydium. 

 Family 7. LiCEACEiE. — Sporangial wall cartilaginous. 



Sporangia solitary, sessile. Licea. 

 Family 8. Tubiferace.*;. — Sporangial wall membranous, without round plas- 

 modic granules. 

 Sporangia tubular compacted. (Tuberijera ( = Tubulina). 



