CHJETOPHORACE^E. 193 



Drapaxnaldia plumosa. (Vanch.) Ag. Syst. p. 58. 



Threads and primary branches hyaline, cells equal or shorter 

 than their diameter, rarely a little longer, a little, or but scarcely 

 constricted at the joints, chlorophyllose bands narrow, bright 

 green, lower cells of the branches equal or almost twice as long 

 as their diameter, upper cells cylindrical, attenuated, 2-5 times 

 as long as broad, sometimes not piliferous, fascicles of the branches 

 densely branched, elongated, with an acutely lanceolate outline, 

 erect, somewhat appressed. 



SIZE. Cells of main thread -045 mm., of fascicles '008 mm. 



Eng. Fl. v., 388. Eng. Bot. ii., t. 2544. Haw. Man. 121. 

 Jolmst. Fl. Berw. ii., 258. Mack. Hib. 222. Flor. Dev. ii., 50. 

 Hook. Fl. Scot, ii., 77. Gray AIT. i., 303. Hass. Alg.121, t. 

 12, f. 1. Rab. Alg. Eur. iii., 382. Kirch. Alg. Schles. p. G7. 

 Kutz. Tab. Phyc. iii., t. 14. 



Conferva lubrica, Eng. Bot. i., t. 2087. 



In slow streams or pools. 



Much less common than the preceding species. 



Plate LXXVI. Jic/.l. Portion of filament of Draparnoldia plumosa, 

 X 400. Fig. 2. Portion of filament of the variety pulohel la X 400. 



GENUS 73. CHJETOFHORA. Schrank. (1789.) 



Articulate filaments, with the primary branches radiately dis- 

 posed, composed of elongated vegetative cells, with chlorophyll 

 bands as in Draparnaldia and Stigeoclonium ; divided upwards 

 into numerous branchlets, which are shortly artoculated, the 

 ultimate joint attenuated, often empty, scarcely or not at all 

 lengthened into a thread, ultimate branchlets in more or less 

 crowded fascicles, involved in a firm gelatinous, coriaceous, or 

 hard mass, of a globose or subglobose, or plane, expanded, 

 variously lobed form. Propagation the same as in the preced- 

 ing genera. 



Chaetophora pisiformis. (Roth.} Ag. Syst. p. 27. 



Thallus globose, about the size of a pea, often smaller (now 

 and then as large as a cherry), bright green, even, shining, 

 sometimes aggregated, not rarely confluent. 



SIZE. Cells '006-'009 mm., of branches '006 mm. 



Hass. Alg. 128, t. ix., f. 5, 6. Kutz. Tab. Phy. iii., t. 18, 

 fig. 3. Grev. Sc. Crypt. Fl., t. 150. Rabh. Als?. Eur. iii., 383. 

 Kirch. Alg. Schl. p. 69. Eng. Fl. v., 389. Haw. Man. 123; 

 Berk. Glean, t. 1, f. 1. 



