CHJSTOPHORACEJ2. 180 



Propagation by oospores or zoogonidia, the latter formed by 

 division (4-16) of the cell contents, each zoospore furnished with 

 a red parietal spot and four vibratile cilia. 



Stigeoclonium thermale. Braun in Kutz. Spec. p. 352. 



Bright green, very much branched in a fasciculate manner, 

 somewhat creeping at the base, filaments and branches attenu- 

 ated upwards to the cuspidate apex, branchlets for the most 

 part alternate, rather remote, nearly erect or somewhat diver- 

 gent, setiform, joints variable in length, at the base of the 

 filaments equal or twice as long as the diameter, becoming 

 turgid, in the upper part of the branchlets 3-5 times as long a* 

 the diameter ; chlorophyllose bands broad, sometimes effused. 



SIZE. Cells -012 mm. 



Kabh. Alg. Eur. iii., 376. Kutz. Tab. Phyc. iii., t. 2, f. 4. 

 Draparnaldia elongata, Hass. Alg. 123, t. 10, f. 3. Ann. 

 Nat. Hist. Aug. 1842, xi., p. 4. 



In thermal springs, &c. 



Hassall found this species on one occasion growing in a horse-trough. 

 It is sometimes mixed with other algae in ditches. 



Plate LXXIII. fig. 2. Filament of Stigeoclonium thermale with 

 zoogonidia X 400 diam. 



Stigeoclonium tenue. Ag, Syst. 57. 



Bright green, lubricous ; filaments a little branched, branches 

 nearly simple, cells equal or 2-3 times as long as their diameter, 

 more or less distinctly constricted ; chlorophyllose bands 

 narrow ; branchlets scattered, shortened, nearly erect, subulate ; 

 cells at the base longer than broad, abbreviated towards the 

 apex. 



SIZE. Cells -01 mm. diam. 



Kutz. Tab. Phyc. iii., t. 3, f. 1. Rabh. Alg. Eur. iii., 377. 

 Kirch. Alg. Schles. p. 68. 



Draparnaldia tennis, Eng. PI. v., 388. Eng. Bot. ii., p. 199. 

 Harv. Man. 122. Mack. Hib. 222. Hass. Alg. 123, t. 11, 

 f. 2. 



Conferva lubrica, Dillw. Conf. t. 57. Grev. Fl. Ed. 318. 

 Hook. Fl. Scot, ii., 82. Gray Arr. i,, 303. 



Conferva exigna, Dillw. Conf. t. 2 (young), 



In streams and ditches. 



" At first the filaments are enclosed, in the manner of a Cktetophora, 

 in a common, somewhat definite gelatine ; afterwards, on its bursting, 

 they issue from it like a Conferva, but aro at all times very gelatinous." 

 Harvey. 



Plate LXXIII. fig. 3. Filament of Stigeoclonium tenue X 400 diam. 



