2 28 American Quarterly Microscopical Journal. 



cells green, Pahnella, Lgb^ 



cells pale red, Porphrydhim, Ng. 

 in families or isolated, without gelatin, 



cells spindle-shaped, in sheaves, Raphidiwn, Ktz. 

 cells spherical, 



in grape-like families, Dimorphococctis, A. Br. 



single, or in spherical families, Pleiirococcus, Mgh. 



The family of Palmelleae includes the smallest forms of 

 chlorophyllaceous Algae, which, in their mode of increase and 

 occurrence, are allied to the lowest of the Phycochromacece 

 (Chroococceae). The green color is rarely replaced by red 

 (Erythrophyll or red oil). Those species living in water — with 

 the exception of Pleiirococcus — are rarely especially noticeable ; 

 others form green coatings in moist places out of water. 

 Only a few are particularly important; most of them are spar- 

 ingly distributed. 



Many are doubtless stages of development of other Algse or 

 Lichens. 



[Indeed, many of the genera here given are not recognized as 

 distinct by other writers ; e.g., Nephrocytium, Gloeocystis, Palmodactylon; 

 and among those mentioned below, only the ones marked * seem to 

 have been identified in this country.] 

 Mischococcus confervicola, Ng., lives on filamentous Algae in 



swamps. 

 Cos?nocladium pulcliellum, Breb., appears very rarely in marshes. 

 Hormosphora ?niitabilis, Breb. Rare in forest marshes. 

 *Hydrurus penicillatus, Ag. In mountain streams and brooks. 



[Var. occidentalis, Harv. Frond 1-2 feet long, much branched ; 

 branches worm-like, tapering to a fine point, naked, or with villous 

 ramuli ; cells pear-shaped, twice as long as broad. Found in strong 

 currents.] 



Schizochla?nys gelatifwsa, A. Br. In marshes. 

 Nephrocytium Agardhianum, Ng. Rare in marshes and ditches. 

 Palmodactylon varium and P. semplex, Ng. The same. 

 Apiocystis Brauniana, Ng. On filamentous Algae, not common. 

 Gloeocystis ampla, G. vesiculosa and G. botryoides, form green coat- 

 ings under water. 

 * Dictyosphcerium Ehrenbergianuni, Ng. Tolerably wide-spread. 



[*Z?. puIcheUum, Wood. " Thallus sub-globose, sometimes indis- 

 tinctly lobate, sometimes almost wanting ; cells globose, mostly 

 scattered, but sometimes crowded."] 

 Glxococcus is rare. 



