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A C H N A N T H E S BREVIPES.
Short-stemmed Achiimthes.
C l a s s a n d O r d e r CRYPTOGAMIA A L G 43, £ m « . - N A ï . O r d . ALGÆ, Juss.
( Ï E N E R i t C 'tíA I ÍÁ C T E 'í í^
Corpuscula plana, articúlala, stipitata, vexilliformia, articulis secedentibus.
Plane, jointed, stipitate, standard-shaped, minute bodies, separating at the
articulations.
S P E C I F IC c h a r a c t e r .
A chnanthes brevipes ; articulis bipunctatis, stipite brevissimo.
A. joints bipunctate, the stipes very short.
A chnanthes brevipes, Ag. Syst. Alg. p. 1.
A chnanthes adnata, Bory, Diet. Class. d’Hist. Nat. v. I. p. 79. fig. 2, (Ar-
throdiées.)
E c h i n e l l a stipitata, Lyngb. Hyd. Dan. t. 70— Jurg. Alg. Exsicc. No. 13.
H ab. On small algæ in the sea. Appin, Captain Carmichael.
Plant very minute, parasitic on various species of small algæ, composed of
four or five joints, the lowermost one furnished with a stipes, scarcely
longer, in general, than the smaller diameter of one o f the joints. Joints
curved, or forming a very obtuse angle in the centre, so short that each
may be said to be transversely linear, four of them forming nearly a
square : they are pellucid, and marked with two oval or oblong orange
spots ; they separate readily at the articulations, and therefore individuals
are frequently observed with three, two, or even a single joint only
remaining, attached by its stipes.
This little alga, so whimsical in its appearance, is more
nearly allied to Achnanthes longipes, represented in “ English
Botany,” under the name of Conferva stipitata, than to Achnanthes
unipunctata, figured in my last number. It is well
marked by its short stipes, and the two spots in each articulation,
as also by the absence of the dense striæ which characterise
A. longipes.
mm