DIVISION EIGHT — SCIENCE. 6ll 



PEDIASTRUM MEYEN. 



P. BORYANUM (Thurp.) Menegh. Frequent in stagnant water. 



HYDRODICTYON Roth. 



H. UTRICUL.\TUM Roth. Common in streams. 



PANDORINA Ehrb. 



P. MORUM Bory. Common in stagnant water. 



GONIUM Muell. 



G. PECTORALE Muell. In stagnant water in .Arroyo Seco. 

 EUDORINA Ehrb. 



E. STAGNALE Wolle. In stagnant water in Arroyo Seco. 

 EUGLENA Ehrb. 



E. viRiDis (Schrank.) Ehrb. Frequent in stagnant water. 



Order. Conjugate . Desmids, Diatoms, etc. 



CI.OSTERIUM Nitsch. 



C. MONtLlFERUM (Bory.) Ehrb. Frequent in stagnant water. 

 C. ENSIS Delp. In stagnant water at Oak Knoll. 



CALOCYLINDRUS D. By. 



C. coNNATrs (Breb. ) Kirch, var. minor Nord. Frequent in stagnant water. 



COSMARIUM Corda. 



C. CORDANUM Breb. In stagnant water in Arroyo Seco. 

 CYMBELLA Agardh. 



C. GASTROiDES Kuetz. Common in stagnant water. 



COCCONEMA Ehrb. 



C. MEXiCANUM Ehrb. Common in stagnant water. 

 NAVICULA Bory. 



N. SUBINFLATA Grun. In water in Arroyo Seco. 

 GOMPHONEMA Agardh. 



G. ACUMINATUM Ehrb. In stagnant water in Arroyo Seco. 

 COCONEIS Ehrb. 



C. PEDicuLUS Ehrb. On Cladophora in M. C. 



C. CALiFORNiCA Grun. In stagnant water in Arroyo Seco. 

 SYNEDRA Ehrb. 



S. VALENS Ehrb. Common in stagnant water. 

 MERIDION Agardh. 



M. CIRCULARS (Grev.) Ag. Common in stagnant water. 

 MELOSIRA Agardh. 



M. VARiANS Ag. Common in stagnant water. 

 MESOCARPUS Hass. 



M. RADiCANS Kuetz. Stream in Arroyo Seco. 



M. SCALARIS (Hass.) D. By. In stagnant water in Arroyo Seco. 

 ZYGNEMA Kuetz. 



Z. STELLIUM Ag. On wet rocks in Rubio canyon. 

 SPYROGYRA Link. Pond-scum. "Frog-spittle." Brook-silk. 



S. AENATA Kuetz. Frequent in stagnant water. 



S. fusco-aTra Rab. In stagnant water in Arroyo Seco. 



S. orthospira (Naeg.) Kuetz. Frequent in stagnant and running water. 



S, crassa Kuetz. Frequent in stagnant water. 



S. QUININA ( Ag. ) Kuetz. Com. in stagnant water. Conjugates during April and May. 

 ASCOPHORA Tode. 



A. MUCEDO Tode. (Common black mould.) Common on decaying substances. 

 MUCOR Linn. Black mould. 



M. MUCEDO Linn. Occasional on decaying substances. 



M. RACEMOSUS Fres. On decaying cooked onion. 

 EMPUSA Cohn. 



E MUSCAE (Fr.) Cohn. (Fly fungus) On flies. 



