'1 JOURNAL OF THE 



the material of this locality; nevertheless, it is offered in this 

 imperfect form in the hope that it may prove to be of some value 

 as a contribution to the Flora of North Carolina.* 



The Desmidiese are microscopic, unicellular plants of the order 

 ( 'onjugatse. They are possessed of chlorophyll and absorb 

 through their walls nourishment from the water in which they 

 float or swim. They are confined to fresh water. The cell is 

 usually constricted in the middle into two similar halves, and in 

 general outline varies from cylindrical, crescent, and dumb-bell 

 shape to the elliptic and circular, with margins smooth, or toothed, 

 or lobed. The all but endless variety of their forms, combined 

 with perfect symmetry of parts and exquisiteness of structure, 

 makes the study of them a never-failing source of instruction 

 and delight. 



The following species in the vicinity of Wake Forest have 

 been identified : 



Hyalotheca disilliens, Brebisson. 



Hvalotheca mucosa, Ralfs. 



Desmidium Schwartzii, Agardh. 



Desmidium Bayleyi, Wolle. 



Desmidium aptogonium, Brebisson. 



Sphserozosma spinulosum? Delponte. 



Mesotaenium Eudlicherianum, Naegeli. 



Spirotrenia condensata, Brebisson. 



Spirotamia obscura, Ralfs. 



Penium digitus, Brebisson. 



Penium interruptum, Brebisson. 



Penium oblongum, De Bary. 



Penium crassa, De Bary. 21 micros. 



Penium lamellosum, Brebisson. 



Penium margaritaceum, Brebisson. 



Penium closterioides, Ralfs. 38 micros. 



*In making the determination of species I have used the great works of Kev. Francis 

 Wolle on the Desmids and on the Fresh-water Algse of the United States. In case of 

 difference of size (diameter) from that given by Wolle, I have stated the size in micro- 

 millimetres. 



