464 BIOLOGY OF THE PROTOZOA 



Family 2. Didymiidae MacBr. em. 



3. Calcareous deposits crystalline; stellate 



Genus Didymium 

 Calcareous deposits in form of scattered 

 scales Genus Lepidoderma 



4. Outermost peridium gelatinous Genus Colloderma 



Outer peridium hardened Genus Diderma 



Legion 2. Stemonitales MacBr. 



1. Fructification aethalium4ike; columella 



rudimentary or absent Family 1. Amourochaetidae 



Fructification with distinct sporangia .... 2 



2. Capillitium well-defined; columella prom- 



inent, long Family 2. Stemonitidae 



Capillitium developed from top of colum- 

 ella Family 3. Lamprodermidae 



Family 1. Amourochaetidae MacBr. em. 



A single genus Genus Amourochaeta 



Family 2. Stemonitidae MacBr. em. 



1. Sporangia grouped; capillitium with ves- 



icles Genus Brefeldia 



Sporangia distinct 2 



2. Stipe and columella jet black 3 



Stipe and columella whitish; calcareous 



Genus Diachaea 



3. Tips of capillitium branches free. . .Genus Comatricha 

 Tips united forming a surface network 



Genus Stemonitis 

 Family 3. Lamprodermidae MacBr. em. 



1. Columella through sporangium, capillitium 



apical Genus Enerthenema 



Columella only part way through sporan- 

 gium 2 



2. Capillitium fully developed 3 



Capillitium rudimentary ; minute forms 



Genus Echinostellium 



3. Capillitium does not form a net. . . .Genus Clastoderma 

 Capillitium forms an intricate net. . . Genus Lamj>roderma 



Legion 3. Cribrariales MacBr. 



1. Sporangia distinct and separated 2 



Sporangia associated 3 



2. Walls of sporangia perforate, especially 



above Family 1. Cribuariidae 



Walls not perforated; sporangia witli lid 



Family 2. Oroadellidae 



3. Sporangia irregularly grouped in delicate 



membrane Family 3. Liceidae 



Sporangia definitely grouped 4 



4. Walls of sporangia not perforated; tubular 



Family 4. Tubiferidae 

 Walls of sporangium perforated or frayed 



Family 5. Reticulariidae 

 Family 1. Cribrariidae MacBr. em. 



Peridium with meridional ribs or thickenings 



Genus Dictydium 

 Peridium with apical thickenings only. .Genus Cribraria 



