DRAPARNALDIA Zit 
not be given varietal rank as was done in the case of C. clegans 
pachyderma (Wittr.) Schmidle, 7. c. 
CHAETOPHORA CALCAREA Tilden, Am. Alg. 77. Y894 ; ; Minn. 
Bot Stud. x: 229. 19905; Bot Gaz- 33: 102. pf 4, g. K 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. I2: 
399 ff. 1808 
Charospermum 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. glomerata). [Named in honor of the 
French botanist, J. PR Draparnaud.* ] 
Synopsis of Species 
Rachis clearly traceable to or beyond the summit of the fascicles of branchlets. 
Fascicles mostly erect, وید وین ده‎ at the apex. Eu peri 
Fascicles ascending or spreading, broadly ovate, acuminate. à D. acut 
Rachis soon lost in the Segen of the orbicular, کیہ‎ WE 
Cells of main branches much inflated, chromatophore narrow. 3. glomerata. 
Cells of main branches cylindrical, er broad. 4. D. platyzonata. 
* 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. 
