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72 LEMANEÆ.
1763.; Hook. Brit. Flora, ii. p. 322.; Harvey, in Manual,
p. 119.
Hab, Mountain streams near LudloAV ; JDillenius. Angle-
se a : Beo. H. Davies.
“ I t is noAv more than ten years since I observed, for the
first time, this species, and I have named it after the very
peculiar form and remarkable curvature of its filaments, Lc-
mania incurvata. I believe that so very characteristic a
name ought to be maintained; that which other botanists
have since given to this plant applies equally to two orders
of Confervce.
“ The Lematiia'incurvata abounds in certain rivers ; I have
aboA’e all observed it in the Dordogne, near the little town of
Sainte Forx. The fishermen bring it up from the bottom of
the river in their large nets. I t has been confounded with
the following species, even by LinnoBus himself; the figures
47 and 48, given hy Dillenius, and that of Vaillant, referred
to alike indifferently by their authors, prove this.
“ From a little horny disc, fixed to the hard bodies which
support it, arise from six to thirty filaments, from one inch
to two inches and a half in length, curved in one direction,
perhaps by the continual action of the current, to which their
rigidity opposes itself in vain. Their colour is of a brownish
or reddish green, obscure or livid. They acquire in diametcr
tho greatest dimensions of all the Conferves.
“ The joints are ovoid and thinned (amincies) at their point
of contact, rvhile, in the following species, the contrary is
always observed. The Lemania incurvata is moi’eover shorter
and thicker, and the filaments but rarely b ra n c h e d .—Borxj.
2 . L e m a n ia f l u v ia t i l i s Ag.
Char. Fi’ond ramose. Inflations subdistant, oblong.
Lemania {corallina') filamentis sub simplicibus, articulis ob-
longis, extremitatibusturgidis, vol. xii. pi. xxi. fig. 2.; Bory,
ill Annales du Musée. Chantransia {fluviatilis) viridi-
nigrescens ; filamentis subdivisis, cax'tilagineis ; ax'ticulis
teretibus, geniculis tumidis, Cand. Syn. 10. Chantraxisie
I L EM A N IA . 73
fluviatile Cand. Flor. fr. 2. 50. Polysperma fluviatilis
Vauch. Conf. p. 99. PI. 1. fig. 3. et pi. x. fig. 1, 2, 3.
Conferva {fluviatilis) filis subramosis, setaceis, nodosis,
geniculatis ; geniculis torxdosis, angulatis, §'c., Both. Cat.
Bot. iii. 304. Conferva fluviatilis filamentis setaceis,
nodosis ; gexdculis elevatis, brevibus, ax'ticulis oblongis,
cxjlindraceis, Roth. Cat. Bot. i. 201. ; Fl. German,
iii. 528, Confex'va fluviatilis var. /3, Fncyc. Met. Die.
No. 12. ; Thore, Chloris, 441. Conferve rameuse var.
/3, Lam. Flor. fo. 1278. ix. Conferva {fluviatilis) filis
simplicibus, setifox'mibus, rectis, genicxdis crassioribus, angulatis,
Lin. Sp. 1635. Conferva fluviatilis, lubi'ica, se-
tosa, equiseti facie. Dill. Muse. vili. f. 47. Corallina
fluviatilis non ramosa, Vaili. Paris, p. 40. t. iv. fig. 5.
Nodularia fluviatilis Lyng. t. 29. Lemania fluviatilis
Kutzing, Phycologia Generalis, p. 322. ; Dillw. Brit.
Conf. PL ; Hooker, Brit. Flor. ii. p. 322. Conf. flu v ia tilis,
English Botany, t. 1766. Lemania fluviatilis
Harvey, in Manual, p. 119.
Hab. In the Winterbourne Stream, Lewes : W. Borrer,
Esq. In the stream at Hamsell, and at the Waterfall
a t Harrison’s Rocks in abundance : Mr. Jenner. Common
in rapid streams about Aberdeen : Dr. Dickie.
Frequent in Ireland : Mr. Moore.
“ The name of fluviatilis, adopted after Dillenius by
authors, does not well apply to a plant much less frequent
in rivers than any one of its congeners. The name, borrowed
from Sebastian Vaillant, better designates our Lemania, and
gives a very ju st idea of its bearing.
“ The Lemania corallina is one of the most common of
Conferva ; it is frequently found attached to stones, and upon
stakes tha t are always covered with water, near mill-dams,
or against the sides of their channels. I have seen falls which
were quite covered ; the more rapid the current the more
the Lemania prospered. I t becomes sometimes more than
half a foot in length, and of a considerable diameter. The
plant languishes or dies when any circumstance renders the
AVatcr in which it has grown stagnant.