PAPERS BY MEMBERS 81 



Sorastrum spinulosum Xaegeli. 



Frequent in most of the permanent ponds. 



Hydrodictyaceae 



Hydrodictyon reticulatum t L.) Lagerheim. 



A common plant in the town branch a? id the bottom lanu 

 ponds near Xewton. My records of its occurrence ex- 

 tend from ^Nlay to September. 

 Pediastrum angulosum (Ehreni^erg) ^fenc-^iuHi 



Rare in the pl.iiikton of londs. 

 Pediastrum Boryanum (Turp.) Meneghini. 



\'ery abundant. 

 Pediastrum duplex Meyen. 



Aery abundant. 

 Pediastrum duplex clathratum A. Braun 



Common with the type. 

 Pediastrum tetras ( Ehrenb.) Ralfs. 



Rare, among other species. 



Ulotrichales 

 Ulotrichacae 



Ulothrix variabilis Kuetzing. 



A common form in pools and permanent streams. In 

 the pools along the Big Four R. R. it is commonly ac- 

 companied by its hormospora form. This seems to be 

 the only species of Ulothrix in this part of the state. 

 Schizomeris Leibleinii Kuetzing. 



Rather rare in streams and ponds. Xear Charleston it 

 has been noted in Hodgen's pond, the campus Lily 

 pond and Campus creek. It also occurs in the town 

 branch, near Ef^ngham. Most abundant in the sum-r 

 mer and autumn. . , 



Stichococcus bacillaris X'aegeli. 



The form confervoideus is probably common in inter- 

 mittent streams, pools and swamps in early spring. 

 Fide Collins. 

 Stichococcus flaccidus (Kuetzing") Gay. 



\'ery common on shaded moist ground. Frequently as- 

 sociated with moss protonemata especially of Funaria 

 and Pottia. Fide Collins. 

 Stichococcus subtillis ( Kuetzing") Klercker. 



Abundant in early spring in pools and intermittent 

 streams. 

 Microspora stagnorum (Kuetzing) Langerheim. 



A'ery abundant in ditches, pools, and intermittent 

 streams in late autumn, during winter thaws, and in 

 early spring. Fide Collins. 



