CH ETOPHORACE. 193 
Draparnaldia plumosa. (Vauch.) 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 piliterous, 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., 888. Eng. Bot. ii., t. 2544. Harv. Man. 121. 
Johnst. Fl. Berw, ii., 258. Mack. Hib. 222. Flor. Dev. ii., 50. 
Hook. Fl. Scot. ii., 77. Gray Arr. i, 303. Hass. Alg.121, t. 
12, f.1. Rab. Alg. Eur. iii, 382. Kirch, Alg. Schles. p. 67. 
Kutz. Tab. Phye. iii, t. 14. 
Conferva lubrica, Eng. Bot. i., t. 2087, 
In slow streams or pools. 
Much less common than the preceding species. 
Plate LXXVI. fig. 1. Portion of filament of Draparnaldia plumosa, 
X 400. Fig. 2. Portion of filament of the variety pulehella x 400. 
Genus 73. CHZETOPHORA. Schrank. (1789.) 
Articulate filaments, with the primary branches radiately dis- 
posed, composed of elongated vegetative cells, with chloropayll 
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. 
Chetophora 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 :V06--009 mm., of branches 006 mm. 
Hass. Alg. 128,t. ix., f. 5,6. Kutz. Tab. Phy. iii., t. 18, 
fig. 8. Grev. Sc. Crypt. Fl., t. 150. Rabh. Alg. Eur. iii., 388. 
Kirch. Alg. Schl. p. 69. Eng. Fl. v., 889. Harv, Man, 123, 
Berk. Glean. t. 1, f. 1. 
