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C A L O T H R IX LüTEOLA.
Yellowish Calothrix.
C l a s s a n d O e d e k CRYPTOGAMIA ALGA3, Linn.— N a t . O r d . ALGAl, Juss.
G E N E R IC C H A R A C T E R .
Fila muco matricali destituta, affixa, rigidiuscula, tubo continuo, intus annulato.
Filaments destitute of a mucous layer, fixed, somewhat rigid, the tube continuous,
annulated within.
S P E C I F IC c h a r a c t e r .
C a l o t h r i x lateóla. ;ß lis hyalinis, luteolis, tenuissimis, elongatis, flexibilis, spar-
C. filaments hyaline, yellowish, exceedingly slender, elongated, fiexible,
scattered.
H a b . In small rocky pools on the sea-shore, a little below the ordinary
fiood level; parasitic on Scytosiphon fieniculaceus, Solenia clathrata, Fcto-
carpi, and other filiform Algae, in the autumn. Appin, Captain C a r m
i c h a e l .
Plant of a pale yellowish colour, investing the stems of filiform Alg® with
its numerous filaments, and giving them a most delicate feathery appearance.
Filaments nearly a line in length, exceedingly fine, transparent,
equal, somewhat rigid, b u t perfectly fiexible, fixed by their base,
very numerous, b u t neither fasciculate nor tu f te d ; the annular divisions
only visible in the most favourable light, and under the nicest management
of the microscope.
A most delicate new species, kindly communicated by my
friend Captain C a r m i c h a e l . Tbere can be no doubt of tbat
natm-alist being correct in referring it to tbe genus Calothrix;
for tbougb it is impossible to ascertain the structure, on account
of its extreme tenuity, the habit is too strong to be mistaken.
Captain C a r m ic h a e l observes that he has found it
in the same spot during five successive years.
Calothrix is a g en u s fou n d ed b y P ro fe sso r A g a r d h to rec
e iv e various p la n ts, forme rly sp e c ie s o f Confervw an d Oscilla-
YOL. V.