The English flora - SeaweedAfrica

—
tfcytortemu.] algm confervoide.e. 365
cumbent branched densely interwoven into blackish tufts,
branches suberect dichotomous and fasciculate, within furnished
with transverse rings." Grev.—Ag. Syst. Alg. p. 38. Lyngb.
Hydroph. Dan. p. 97. /. 28. Grev. Edin. Crypt, p. 302.
Moist rocks in the PeiUland hills, Messrs. Arnoti and _ Greville.—
give this on Dr. Greville's authority. I have examined his specimens;
but can find little to distinguish
The annuli are often bipartite.
them from the young of S. pannifmne.
3. S. minutnm, Ag. {dwarf Scytonemd) ; filaments minute
erect rigid flexuose fastigiate collected in a dark crust, branches
short.—Ag.
p. 39?
Syst. Alg. p. 39 S. crustaceum, Aq. Syst. Ala.
On rocks and crustaceous lichens; common in alpine districts.
Appin, Captain Cannichael. (arrigataha, near Caher, and at Killarnev,
W. H. Harvey.— Plant either spreading in a black suborbicular crust or
scattered in little tufts i filaments erect, minute, closely packed, olivaceous;
branches irregular, obtuse, ascending. I have made S. cru.slaceum,
Ag. a synonym, more on Carmichael's authority than on my own
observations; he remarks, " The difference between them hardly
amounts to a specific one; without the aid of the dark central line, it
would be nothing. But this, so far from being peculiar to-£. criistaceum,
is of common occurrence in all the species; so much so, that it might
perhaps be adopted with advantage into the generic character, were it
not that it seems to indicate a defect rather than a peculiarity, perhaps
a failure from sterility in the sporaceous matter of the filaments."
Carm. MSS.
4. S. myochrous, Ag. (Mouse-shin Scytonema) ; filaments
elongate mostly decumbent subrigid flexuose slender yellowbrown,
branches issuing in pairs at right angles with the stem.
—Ag. Syst. Alg. p. 40. Lyngb. Hydrop/t. Dan. t. 27 Conferva
myochrous, Dillw. Conf. t. 19. E. Bot. t. I.Vjo.— Conferva
mirabilisy E.Bot. t. 2219, (according to the original specimens.)—
Scyt. ocellatum, Lyngb. Jfydroph. Dan. t. 28. (not of British
authors).
Alpine bogs and rivulets.— Filaments decumbent, rarely tufted, closely
interwoven into a daik-brown stratum, very flexuose; branches .simple,
issuing in pairs at right angles, often adhering together throughout their
whole length, but more generally soon divaricating, wr\ rarely solitary.
St//,/- distant. The manner in which the branches are riven off in
this species is yery curious, and quite unlike what takes place in S.
ocellaiuoi, so that this, wen- there no other characters, would afl
abundant grounds of distinction between them. At first Bight, they
appear to Be oppositional, or resulting merely from the lateral coherence
Of two simple filaments. ThlS, howe\cr, IS not th
by the tube above and below the point of ramification being continuous
and unbroken, at the opposite tide from the branches, as well as bj tra-
cing the various stages of the plant with a good microscope. Hm tin,
are at first simple continuous tube-, containing a coloured iporace
mass (end which is closelj marked with tranarerse stria* and
broken, Bsifbj dissepiments, at uncertain distano
diss* pimrntsH rupture takes place on one tide of the sheath, and th<
dochnmc issues in two columns, ;u fust resembling lammilht, but finally
I