66] The Classification of Lower Organisms 



aggregate to grow to macroscopic dimensions; or may produce one, two, or four 

 zoospores. Chlorosaccus Luther, the standard genus of class Heterokonta. 



Family 2. Mischococcacea [Mischococcaceae] Pascher in Hedwigia 53 : 14 ( 1912). 

 Microscopic colonies of globular cells joined by dichotomously branching gelatinous 

 strands. Mischococcus. 



Family 3. Chlorotheciacea [Chlorotheciaceae] Luther in Bihang Svensk. Vetensk- 

 Akad. Handl. 24, part 3, no. 13: 19 (1899). Families Chlorobotrydiaceae and Sci- 

 adiaccae Pascher in Hedwigia 53: 17 (1912). Family Halosphaeraceae Pascher 

 (1925). Family Ophiocytiaceae Auctt. Cells solitary, free or attached, capable of 

 reproduction by division to form multiple zoospores, in some examples capable 

 alternatively of producing multiple minute non-motile cells of the same form as 

 the parent. Large free multinucleate cells, more or less globular: Botrydiopsis, Leu- 

 venia. Smaller cells, elongate, curved or coiled: Characiopsis, Spirodiscus. Spirodiscus 

 fuluus Ehrenberg in Abh. Akad. Wiss. Berlin 1830: 65 (1832) {nomen nudum) and 

 Infusionsthierchen 86 (1838), whose identity has been a standing puzzle to bac- 

 teriological systematists, is an older name of Ophiocytium parvidum (Perty) A. 

 Braun (Copeland, 1954). It antedates the generic name Ophiocytium Nageli (1849); 

 new combinations are required for the dozen additional species of this genus. The 

 cells attached: some species of Characiopsis; Perionella; Dioxys. 



Family 4. Botryococcacea [Botryococcaceae] Pascher in Hedwigia 53: 13 (1912). 

 Solitary or colonial cells reproducing strictly by production of non-motile cells. 

 Botryococcus. Pseudotetraedron. 



Family 5. Stipitococcacea [Stipitococcaceae] Pascher in Beih. bot. Centralbl. 48, 

 Abt. 2: 324 (1931). Family Stipitochioridae Deflandre in Grasse Trate Zool. 1, fasc. 

 1: 221 (1952). Amoeboid cells with green plastids, partially enclosed in loricae at- 

 tached to objects in water. Stipitococcus. 



Family 6. Chloramoebacea [Chloramoebaceae] Luther in Bihang Svensk. Vetensk.- 

 Akad. Handl. 24, part 3, no. 13: 19 (1899). Family Chloramoebidae Poche in Arch. 

 Prot. 30: 155 (1913). Families Heterochloridaceae and Rhizochloridaceae Pascher 

 Siisswasserfl. Deutschland 11: 22, 26 (1925). Y^.miWts Heterochloridae, Rhizochlori- 

 dae, Chlorarachnidae and Myxochloridae Deflandre in Grasse Traite Zool. 1, fasc. 1 : 

 217-222 (1952). Amoeboid organisms with green plastids, without loricae, some- 

 times swimming by means of paired unequal flagella. Chloramoeba, Chlorochromo- 

 nas, Rhizochloris. 



Family 7. Tribonematacea [Tribonemataceae] Pascher in Hedwigia 53 : 19 ( 1912) . 

 Family Confervaceae Luther (1899). Family Monociliaceae Smith Freshw. Algae 

 160 (1933). Green Heterokonta producing filaments of uninucleate cells. The Lin- 

 naean genus Conferva included a great variety of growths in water. Definite groups 

 were separated from it, one after another, until the residue was a natural group; but 

 this residue cannot be assumed to be the type of Conferva L.; that name is to be 

 abandoned as a nomen confusum. The remnant in question has become two genera, 

 Tribonema Derbes and Solier, 1858, and Bumilleria Borzi, 1895. They are unbranched 

 filaments, common in freshwater pools. From typical green algae of similar appear- 

 ance they are distinguished in the first place by the presence in each cell of several 

 disk-shaped plastids without pyrenoids or with obscure ones. The cell walls, when 

 treated with sulfuric acid, can be seen to consist of two parts like a barrel sawed 

 across the middle. A broken filament ends always with a broken half wall. Monocilia, 

 an unfamiliar alga isolated from soil, difi^ers in producing branching filaments. 



