352 BIOLOGY OF THE PROTOZOA 



Legion 2. Stemonitales MacBr. 



1. Fructification sethalium-like ; columella 



rudimentary or absent Family 1. AMOUROCH^TiDiE 



Fructification with distinct sporangia 2 



2. Capillitium well-defined; columella prom- 



inent, long Family 2. Stemonitid^ 



Capillitium developed from top of colum- 

 ella Family 3. Lamprodermid.e 



Family 1. Amourochsetidae, MacBr. em. 



A single genus Genus Amourochoeta 



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 Diachoea 



3. Tips of capillitium branches free — Genus Comatricha 

 Tips united forming a surface network 



Genus Siemonitis 

 Family 3. Lamprodermidse, MacBr. em» 



1. Columella through sporangium, capillitium 



apical Genus Enerihenema 



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 Lamproderma 



Legion 3. Cribrariales MacBr. 



L Sporangia distinct and separated 2 



.Sporangia associated 3 



2. Walls of sporangia perforate, especially 



above Family L Cribrariid^ 



Walls not perforated ; sporangia with lid 



Family 2. Orcadellid^ 



3. Sporangia irregularly grouped in delicate 



membrane Family 3. Liceid.e 



Sporangia definitely grouped 4 



4. Walls of sporangia not perforated; tubular 



Family 4. Tubiferid^ 

 Walls of sporangium perforated or frayed 



Family 5. Reticulariid^ 

 Family 1. Cribrariidae, MacBr. em. 



Peridium with meridional ribs or thickenings 



Genus Dlctydium 

 Peridium witli apical thickenings only. Genus Cribraria 

 Family 2. Orcadellidse, MacBr. em. 



A single genus Genus Orcadella 



Family 3. Liceidse, MacBr. 



A single genus Genus Licea 



Family 4. Tubiferidse, MacBr. em. 



1. Sporangia stipitate; clustered Genus Alwisia 



Sporangia in linear series 2 



2. Spores olivaceous Genus Lindhladia 



Spores umber Genus Tubifera 



