Otcillutoria.] ALG^ CONFERVOIDEiE. 373 



tic, oscillating, simple, continuous. Endochrome divided by close 

 parallel transverse striae. — Named from the curious oscillatory 

 or lateral motion of the filaments. — The species are very nume- 

 rous and almost impossible clearly to be defined, their characters 

 chiefly depending on external habit. In the following descrip- 

 tions, the colour of the strata always refers to the appearance pre- 

 sented to the naked eye ; that of the Ji laments, to what they appear 

 under the microscope. 



* Fasciculatse. Filaments collected into close rigid agglutinated 

 fascicles. 



1. O. Friesii, Ag. (Fries' Oscillaloria) ; 6tratum bright- 

 green bristling with the elongated rigid erect tooth-like fasci- 

 cles of filaments. — Ag. Syst. Alg. p. 61. — Scytonema Bangii, 

 Lyngb. Hydroph. Dan. t. 28. Fl. Dan. U 1602./. 1. Grev. Fl. 

 Edin. p. 303. 



On mosses, in shady subalpine situations ; near Edinburgh, Dr. Gre- 

 ville. Appin, CapL Carmichael. Tobermorey in Mull, IV. H. Harvey. — 

 Stratum 2 — 3 inches broad, bright aeruginose-green. Filaments closely 

 interwoven into erect, elongated, tooth-like fascicles, an inch or more in 

 height, pale-green (under the microscope), annulated within with a broad 

 limb. Well marked by its erect, spinulose habit. 



2. O. lucifuga, Harv. (small spiny Oscillatoria); stratum 

 blackish-green bristling with minute tooth-like fascicles of fila- 

 ments. — Calothrix lucifuga, Carm. MSS. 



" On the decayed trunk of an Alder, lying in a ravine and buried 

 under" a heap of rubbish," at Appin, Captain Carmichael. — Stratum 

 spreading, dull blackish-green, bristling all over with minute erect fasci- 

 cles, about ^ of a line high. Filaments thickish, He\uose, strongly ag- 

 glutinated together, annulated within, pale-yellowish. Almost like the 

 last species in miniature. 



3. O. chtltouopldstes, Hoftm. (sheathing Oscillatorid); stratum 

 dull-green, filaments parallel penicillatus from the apex of the 



decumbent elongated flexuose sheath-like fascicles. — Lyngb, 



Hydroph. Don. t. '11. A<j. Syst. j>. (ili. — Conferva rmj'uaita. F. 



Hot. t. 1995. (scarcely of DiUw. Conf. t. 99.)— fi, ripens; of 

 a duller <<»loiir with more flexuose fascicles. — Q, repens, Ag. 

 Syst Alg. pi 61. 



u. on the DQttddy sea-shore. Appin, Captain Carmic/nut. — S. on the 

 nuked Boil by road-sides, &c. — Stratum slimy, composed of entangled, 

 decumbent* neathing fascicles, collected into little bundles. 1 he Bheaths, 

 ( laptain < larmicbad observes to appear, a-, it' composed " of the old dead 

 filaments, deprived of their colour and agglutinated together*" 



4. O. tenuissima, Ag. (slender fascicled OsdUaloria); dark- 

 green ascending tufted, filaments simple cylindrical even without 

 any visible joints. Sm.—Ay. Syst. Alg. p. 62. F. Bot.t. 2584. 



In the celebrated iranti waters <>t Bath, spreading, rattier unequally, 

 in broad velvet-like patches, of a dark-green colour, Re\ i D • 



