

38 MISSOURI BOTANICAL GARDEN. 



Euglena spirogyra Ehrbg. Arboretum pool. Large Ne- 

 lumbium pool. Fission observed Apr. 12. 

 Euglena viridis Ehrbg.* 



Phacus longicauda Dujardin. Arboretum pool. Rare. 



Apr., May. 



Phacus pyrum (Ehrbg.) Stein. Garden stream. Nym- 

 phaea pool. Sept., Oct., Mar., Apr., May. Rare. 



Phacus pleuronectes Nitzsch. Arboretum pool. Waterfall 

 stream. Nelumbium pool. Fountain pond. Common. 

 Sept., Oct., Mar. to May. 



Phacus triqueter Ehrbg.* 



ASTASIACEAE. 



Astasia sp.* 



Bacillariaceae. 



Navicula sp.* 



Gomphonema acuminatum Ehrbg. 



Gomphonema constrictum Ehrbg. 3 



* 



Heterokontac. 



CONFERVALES 



CONFERVACEAE 



Ophiocytium sp. Arboretum pond on Microspora. Rare. 



April. 



BOTRYDIACEAE. 



Botrydium Wallrothii Kiitz. (E3) Cabbage patch. Earth. 

 Associated with Protosiphon bo try aides (Kiitz.) Klebs. Nov. 



Botrydium granulatum (L.) Greville. Mint beds on damp 

 loess soil (D4). Abundant. In the first part of March on 

 the damp soil of a flower bed (soil had not been stirred since 

 the previous summer) was noted what proved to be Botry- 

 dium aplanospores in such abundance that the earth looked 

 light green. No Botrydium plants were observed at this time. 

 At the end of March in another bed in a different location 

 were found Botrydium plants in abundance forming dark 



green masses among the more conspicuous brighter green 



