Draparnaldia 217 



not be given varietal rank as was done in the case of C. clcgans 

 pachydenna (Wittr.) Schmidle, /. c. 



Chaetophora calcarea Tilden, Am. Alg. //. 1894; Minn. 

 Bot. Stud. 1: 229. 1895; Bot. Gaz. 23: 102. pi. 8, 9. f. 6, 

 7. 1897. 



There is no character, besides that of secreting lime, furnished 

 in the description of this species that particularly distinguishes this 

 plant from species like C. elegans and C. pisiformis, and that char- 

 acter, judging from the frequence of its occurrence in different forms, 

 can hardly, in our opinion, be considered a point of strong specific 

 importance. 



IV. DRAPARNALDIA Bory, Ann. Mus. Hist. Nat. 12 : 

 399 ff. 1808 



Charospermiim Link, Epist. de Alg. 5. 1820, 



Thallus covered with a soft, gelatinous investment, attached to 

 the substratum by rhizoids developed from the lower cells and 

 often at points of branching ; main filament and primary branches 

 large, bearing, as well as the smaller branches, numerous crowded 

 fascicles of small branchlets which often terminate in a long hyaline 

 seta. Chromatophore, in the cells of the larger branches, a 

 parietal band, sometimes perforated or reticular, containing nu- 

 merous pyrenoids ; in the small cells of the branchlets, a layer 

 covering the inner surface of the cell-wall, containing few pyrenoids. 



Asexual reproduction by means of 4-ciliate zoospores furnished 

 with a red eye-spot, which germinate immediately, and by means 

 of akinetes ; both are formed only in the smaller cells. 



All inhabitants of fresh water. Type species Draparnaldia 

 mutabilis Bory (= D. glomeratd). [Named in honor of the 

 French botanist, J. P. R. Draparnaud.*] 



Synopsis of Species 



Rachis clearly traceable to or beyond the summit of the fascicles of branchlets. 



Fascicles mostly erect, lanceolate, elongated at the apex. I. D. plumosa. 



Fascicles ascending or spreading, broadly ovate, acuminate. 2. D. acuta. 

 Rachis soon lost in the ramification of the orbicular, spreading fascicles. 



Cells of main branches much inflated, chromatophore narrow. 3. D. glomerata. 



Cells of main branches cylindrical, chromatophore broad. 4. D. platyzonaia. 



* The name of this genus has been written Draparnaudia by DeToni and some 

 other recent authors. As the personal name, however, was sometimes written Drapar- 

 nauld, it has been thought best to adhere to Bory's spelling, until good reason is shown 

 for the change. 



