118] The Classification of Lower Organisms 



operculum. Achlyogeton, in green algae, diatoms, and nematodes; of very much the 

 appearance of certain Lagenidialea. 



Family 6. Olpidiacea [Olpidiaceae] Schroter op. cit. 67. Family Monolpidiaceae 

 [Olpidiaceae) A. Fischer op. cit. 20. Holocarpic chytrids, each individual a single 

 intramatrical parasitic center, naked until the reproductive phase, when it becomes 

 a sporangium without an operculum. Olpidium, attacking blue-green and green algae, 

 diatoms, flagellates, Allomyces, Vampyrella, rotifers, and nematodes. Rozella, attack- 

 ing Oomycetes and producing spiny resting spores, has been confused with certain 

 Lagenidialea. The genera Sphaerita and Nucleophaga of Dangeard, including 

 intracellular parasites of amoebas and Infusoria, have been placed in this family; 

 it seems more probable that they should be placed among bacteria of family Rickett- 

 siacea. 



Family 7. Nowakowskiellacea [Nowakowskiellaceae] Sparrow in Mycologia 34: 

 115 (1942). Family Megachytriaceae Sparrow Aq. Phyc. 378 (1943). Pluricentric 

 chytrids, the sporangia with opercula. A moderate number of saprophytes on material 

 of green algae and higher plants. Nowakowskiella, Megachytrium, etc. Zygochytrium 

 was described by Sorokin, 1874, as living on decaying insects, producing multiple 

 operculate sporangia, and exhibiting a conjugation of filaments to produce zygotes 

 much like those of Zygomycetes. It has apparently not been reobserved. 



Family 8. Chytridiacea [Chytridiaceae] Cohn in Hedwigia 11: 18 (1872). Family 

 Chytridieen de Bary and Woronin in Berichte Verhandl. Naturf. Gess. Freiburg 3 

 (Heft 2) : 46 ( 1864). Monocentric eucarpic chytrids, the sporangia operculate. Some 

 fifty species, the majority parasitic on fresh water algae. Chytridium, etc. Catenochy- 

 tridium, saprophytic in cast-off exoskeletons of insects. 



