214 PRELIMINARY CATALOGUE OF PLANTS. 



Palmella, Lyngb. Forms of this genus I omit. They have no value 

 as perfect plants ; they belong to intermediate or arrested life 

 conditions of Algse. 



Porphyridium, Naeg. 



P. cruentum, Naeg. Moist earth, green-houses. 



Gloeooystis, Naeg. Forms of this genus are not rare, but of doubt- 

 ful merits as plants. 



Rhaphidium, Kg. 



R. polymorphum, Fres. Stagnant waters. 

 R. convolutum, Rabh. 

 Var. lunare, Kir. 



Nephrocytium, Naeg. 



N. Agardhianum, Naeg. Genus and species doubtful. 



Pleurococcus, Menegh. Forms of this genus are frequent but of 

 no value ; v. note Palmella. 



ZYGOSPORES. 

 Spirogyra, Link. 



S. communis, Hass. 



S. crassa, Kg. 



S. Grevilleana, Hnss. 



S. inflata, Vauch. 



S. intermedia, Rabh. 



S. insignis, Hass. 



S. longata, Vauch. 



S. majuscula. Kg. 



S. nitida, Dillw. 



S. punctata, Cleve. Atsion. 



S. quinina, Ag. 



S. rivularis, Hass. 



S. stagnalis, Hilse. 



S. varians, Hass. 



S. Weberi, Kg. 



S. fluviatilis, Hilse. 



These forms and the following appear to be quite generally distrib- 

 uted through the State, in streams and ponds. 



Zygnema, Ag. 



Z. cruciatum, Ag. Frequent. 

 Z. insigne, Kg. Frequent. 



