CLADOPHORA. 129 



Syn. Clad, glomerata, var. flavescens, Eab. ; Clad, flavida, Kg. ; 

 Conferva flavescens, Dillw., and others. 

 New Jersey shores, pools of brackish water. 



CLADOPHORA AEGAGROPILA, (Linn.) Kg. 



Dark green, threads rigid, very much branched, radiating 

 from a common center, at length agglomerated into a more 



/ 



or less dense spongy globe. Earnula erect, often quite 

 obtuse, articulations sometimes incrassated upwards; cell- 

 membrane now and then thickened. 



Diameter of filaments, 25-50 n ; cells 1-1 times longer 

 than broad. 



Syn. Conferva aegagropila, Linn. ; Conferva globosa, Phil. Trans. 

 Roy. Soc. 5 Cladophora glomerata, Hass. 



Occurs here in limestone springs, attached to walls, and 

 to stones in streams of cold water, in small subspherical 

 clusters, composed of radiating filaments irregularly and 

 variously branched, every branched filament differing from 

 the other ; diameter of clusters 6-8 mm. Not unlike some 

 of the smaller forms which occur frequently in northern 

 Europe; but our plants appear like small depauperated 

 forms, when compared with some of the large specimens in 

 my herbarium, from Sweden, compact, globular bodies 

 measuring 3-4 inches in diameter. 



Plate CXII, fig. 5. 



CLADOPHORA BRACHYSTELECHA, Eab. 



This form recognized by Dr. Wood, as one of our Clado- 

 phora species, does evidently not belong here. It is one of 

 the forms referred to under Gongrosira, a pseudo-germs. 



It is nothing more nor less than a prothallus, & protonema 

 of some moss. 



Subsection C. PITHOPHORIN^:. 

 (Family PUhophoracece,, Wittr. 1 ) 



This new division is described by the author (Wittrock), as 

 " Chlorophyliferous Cladophora-like Fresh-water Algae, consist- 

 ing of cells formed by bipartitioii of the terminal cell. The 

 thallus has two distinct parts, viz : 1st, the cauloid part, devel- 

 oped from the germinated spore upward, propagative, and almost 



1 Erroneously entered in the system of arrangement adopted for this work, 

 page 48. 



