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C A RM IC H A E L IA a t t e n u a t a .
HiendeV Cwrmichaelia.
C l a s s a n d O h d e i i CRYPTOGAMIA ALGAÍ, L in n N a t . O k d . A LG JE , J uss.
G E N E R IC C H A R A C T E R .
Frons tubulosa, continua, membranácea, reticulata. Frucius ; capsula: ( an granula
capsuliformia?) in soris suborbicularibus coacérvala:; sori lineas transversas
formantes.
Frond tubular, continuous, membranaceous, reticulated. Fruc tification;
capsules (capsule-like granules?) collected into roundish so ri; sori forming
transverse lines.
s p e c i f i c c h a r a c t e r .
C a b m i c h a e l i A a tten u a ta ; ..............................
ScYTOsiPHON olivascens, Carm. MSS.
H ab. Sea-shores, parasitic on various Algre. Autumn. Appin, Captain
C a r m i c h a e l .
Plant one to two feet in length, branched, above a line in diameter, attenuated
at the base, membranaceous, tubular, continuous, of a reticulated
structure, and olivaceous colour, assuming a greenish hue when d r y ;
branches numerous, long, opposite, greatly attenuated at their base, but
still more so at their extremity, sometimes bearing a few opposite slender
ramuli. Fructification consisting of roundish groups, or sori, arranged
in transverse lines about one-sixteenth o f an inch apart, and visible
to the naked e y e ; each group is composed of a number of subglo-
bose capsules (or granules) of a dark colour, individually surrounded
by a pellucid line, and apparently external, or imbedded in the outer
surface of the frond. When the capsules are removed, they still retain
a pellucid border, and seem to be enclosed in a delicate membrane.
In drying, the frond adheres firmly to paper.
The unwearied exertions which my friend Captain C a r m
i c h a e l has made to explore the marine botany of the coast
of Appin, have at length afforded me the gratification of conferring
his name upon a plant which I consider equally new as a
genus and as an individual. The generic name of Scytosiphon,
under which that gentleman kindly communicated it, was ori-
288