(JIl.ETOl'HORACEJE. 191 



Stigeoclonium fastigiatum. (Rolfs.} Kut~. Tab. Pliyc. in., 



t. 8, f. 1. 



Pale green, small, thread very much branched, fastigiate, 

 radiately disposed, mucous, upper branches alternate, fastigiate, 

 moniliform, somewhat pinnate, a little spreading, extended at 

 the apex in a long bristle ; cells of the filament three times as 

 long as broad, the branches equal or twice as long, swollen, 

 constricted at the joints. 



SIZE. Cells '012 mm. diam. 



Eabh. Alg. Eur. iii., 380. 



Chcetophora fastigiata, Ralfs. Alg. Exs., No. 9. 



Attached to aquatic plants. 



Plate LXXir. jig. 3. Filament of Stiyeoclonium fastigiatum X 

 400 diam. 



GENUS 72. DRAPARNALDIA. Ag. (1824.) 



Articulate thread simply branched, formed of large cells, for 

 the most part hyaline, with a broad chlorophyllose band, always 

 sterile; more or less densely furnished with penicellate fascicu- 

 late branchlets, alternate or opposite, composed of smaller 

 fertile cells. Terminal cells of all the branches empty, hyaline 

 and sterile, more or less elongated into a bristle. 



Propagation by resting spores or zoogonidia. 



Drapaxnaldia glomerata. Ag. Syst. p. 59. 



Filaments and primary branches colourless, or nearly so ; 

 lower cells equal, or a little shorter than their diameter, dis- 

 tinctly constricted at the joints ; chlorophyllose bands narrow, 

 pale green, primary branches spreading at right angles, some- 

 times opposite ; fascicles of the branches crowded, alternate or 

 opposite, densely branched, obtuse, oval. 



SIZE. Cells of main thread '035 mm., of fascicles '008 mm. 



Eng. Fl. v., 388. Jenner Tunb. Wells 176. Eng. Bot. ii., 

 t. 2545. Harv. Man. 121. Grev. Fl. Ed. 321. Mack. Hib. 

 222. Flor. Dev. ii., 50. Hook. Fl. Scot, ii., 77. Gray. AIT. 

 L, 302. Hass. Alg. 120, t. 13, f. 1. Eabh. Alg. Eur. iii., 381. 

 Kirch. Alg. Schles. p. G7. Kutz. Tab. Phyc. iii., t. 12. 



Conferva mutabilis, Dillw. Conf. t. 12. Eng. Bot. i., t. 

 1746. 



Batraclwspermum conglomeration, Yaucli. Conf. t. 12, f. 1. 



In clear pools or slow streams. 



