The English flora - SeaweedAfrica

Rusariu.} ALG.li CONFERVOIDJi.t. 071
In small mud-bottomed pools, near the sea-shore, filled at Sj)ring-tides.
Apj)in, Capt. Carmichael.—" Stratum exceedingly thin end lax, extensive,
at first of a vivid-green colour, but passing gradually into a pale
chestnut." Cartn.—Filaments an inch long, flaccid, bent in various
curves, but scarcely tortuous, of a pale verdigris colour under the microscope;
striae rather evident and subdistant. Capt. Carmichael's plant
is of a dull-verdigris hue, without gloss. I have compared it with an
authentic specimen from Agardh, and can detect no difference, except
in colour, which, according to Carmichael, varies with the age of the
individual. Agardh's /3. appears to answ er the British plant very exactly.
5. L. Carmichaelii, Harv. {Capt. Carmichael's Lynybya); filaments
very long thickish curled and tortuous cylindrical floating
under water and forming- extensive grass-green strata. L.
crisjxi, Carm. MSS. cum ic. (not of Agardh.)
Marine rocks and Fuci. Appin, Capt. Carmichael.— " Stratum almost
co-extensive with the object on which it grows. On Fucus vcsiculosus
it may be found upwards of a foot in extent, on the rocks, of -20—30
yards, covering them with an intensely green fleece. Filament* fixed at
the base, but fluctuating freely with the agitation of the water; several
inches long, flaccid, at length becoming curled and convoluted, when
the sporidia, bursting through the tube, leave it partially empty and
pellucid." Carnu— Transverse striae very evident and subdistant. When
dry it is of a dull green, without gloss or any glaucous or verdigris hue,
and, to the naked eye, strongly resembles ft rivularis. Lyngbye's figure
of Cunf. cui/luiia would correspond with it very well; but the description
does not.
6. L. speciosa, Carm. (beautiful Lynybya); filaments long
thick flaccid straight at length curled, the margin eremite, freely
floating in the water and forming extensive bright-green strata.
— Car/.'!. MSS. cum ic.
Marine rocks and Fuci. A ppin, Captain Carmichael.— " This plant
covers the whole surface of the rock or stone, floating loosely in the
water; but, when left by the tide, spreading over it in a thin intensely
The filaments are twice as thick as those of the former
specie-, 3—4inches long, straight and flaccid, at length becoming curled and
crenated by the marginal protrusion of the sporidia. These are ofa very
Hat lenticular form, and when ripe burst through the sides of the tube,
leaving it here and there colourless."
Filaments continuous, tubular, Loculoso-contracted at equal
distances. Loculi containing two sporidia.— Name: rosarium,
//"i- string of bead-— Capt. Carmichael, in proposing
i
thii genus, remarks, " The very minute plants which 1 h
referred to this genus » been described before : perhaps
they are to be found in the genus Fragilaria of Lyngbye and
Meloseira of Agardh ; but I confess I cannot identify eithei
them with any of the specie* described by these authors. To
be admissible into either of these genera, the filaments ought to
he plane and articulated; but, from tin- most minute in-