44 



MISSOURI BOTANICAL GARDEN. 



which Bernard describes (1909 Algaes Unicellulaires) from 



Singapore. Though smaller than the type as generally de- 

 scribed, he considers this variable character not sufficient to 

 establish a new species. 



Kirchneriella lunaris (Kirchner) Mobius. Fountain pond. 

 Sept. to Dec. Nymphaea pool. Mar., June. Rather com- 

 mon. 



Kirchneriella obesa (West.) Schmidle. Nymphaea pool. 

 Mar. to June. Producing auto-colonies in April. 

 Scenedesmus bijuga (Turp.) Wittr. Nelumbh 



Nymphaea pool. 



pond 



nbium 

 stream 



to Dec, Mar., June. Common. 



Scenedesmus obliquus (Turp.) Kiitz. Nelumbium 



d. Waterfall stream. Nymphaea pool. Rather 



common 



Scenedesmus obliquus var. dimorphus (Turp 



Hansg. 



Fountain pond. Nymphaea pool. Nelumbium pool. Wa- 



terfall stream. 

 Scenedesmus 



Mar 



Rather common. 



m 



Nymph 



Fountain pond. 



Sept., 



Dec., Mar. to June. Common. Auto-colonies in Oct. and 

 Apr. 



Selenastru 



Reinsch. 



May 



Nymphaea pool. 



Rare. 



ion 



(Nag.) Hansg. 



April, May. Rather rare. 



iphaea} pool 



Tetraedron trigonum var. pentagouum (Rab.) New combi- 

 nation. Nymphaea pool. Apr., May. Rather rare. 



Wolle has described 



Polycdrium trigonum Nag. : cells 



somewhat compressed, 3-5 angled ; angles obtuse-mucronate, 

 sides more or less concave. Kirchner has suggested the fol- 

 lowing names for varieties (a) typicr 

 Reinsch; (c) tetragonum Rab.; (d) ; 



m 



mi 



m 



um 



Kirch.; (f) bif 



Will 



(See Wolle, 



Freshw. Alg. of U. S. 184. 1887; Kirchner, Kryptfl. 

 Schlesicn, 2 : 104. 1898.) 



von 



d 



made 



