The English flora - SeaweedAfrica

—
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 numerous
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 presented
to the naked eye ; that of the Jilaments, to what they appear
under the microscope.
* Fasciculatse. Filaments collected into close rigid agglutinated
fascicles.
1. O. Friesii, Ag. (Fries' Oscillaloria) ; 6tratum brightgreen
bristling with the elongated rigid erect tooth-like fascicles
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. Greville.
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 filaments.—
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 agglutinated
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. (ili.— Conferva rmj'uaita. F.
Hot. t. 1995. (scarcely of DiUw. Conf. t. 99.)— fi, ripens; of
a duller