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P l a t e CCOIX.
CALOTHRIX SEMIPLENA, Jg.
Gen. Ch a r . Filaments d e s titu te of a mucous layer, erect, tu fte d or a g g
reg a ted , fixed a t th e base, somewhat rig id , n o t o s cillating. Tube
c o n tin u o u s ; endochrome g re en , densely a n n u la ted , a t le n g th d issolved
in to le n tic u la r sporidia. Calo th r ix from /caXos, beautifu
l, an d dpii, a hair.
Calo th e ix semiplena; filaments long, slender, tough, flexuous, densely
interwoven into lamellated tufts ; endochrome glaucous green, Ire-
quently interrupted, leaving parts of the tube empty.
Calotheix semiplena, Ag. Bot. Zeit. 1827, No. 40.
Ca lotheix lamellata, H a n . in Herb. 1844 ! {excl. sp
L yngbya semiplena, J. Ag. Alg. Medit. p. 11.
L yngbya lutescens, lieb. (fide Kiitz.)
L e ib l e in ia semiplena, Kiitz. Bhyo. Gen. p. 221. Sp. Alg. p. 278.
I I ab. In rock-pools near high-water mark, growing on Corallina officinalis
and other small algae. Kilkee, W. I I. I I. Sidmouth. Bev. B ,
Cresswell.
Geoge D is t e . The Mediterranean and Adriatic Seas, Agardli. Shores of
Norway, Areschoug ! (Alg. Scand. No. 8 ! growing with Callithammon Roihit).
Cherbourg, Lenormand (as C.pulvinata'i Ag.)
D e sc e . Mlaments from bah an inch to an inch or more in length, very slender,
simple waved and gently curved, hut not curling, cohering firmly together
in fiattened bundles or tufts, which often expand laterally into laminæ,
which are broad below, and gradually narrowed upwards, standing erect,
and frequently pointed. These laminæ are sometimes loosely bundled
together; at other times they are closely heaped, one on the other, th e
endochrome is dense, of a glaucous or verdegris green colour, and is frequently
interrupted, leaving long spaces of colourless tube between each
frustum of endochrome. The apices of the filaments are blunt. Substance
membranaceous, but tough, adhering to paper in drying.
I have to apologize to the readers of the ‘Phycologia’ for
having, under PI. LXXVI. (Calothrix pannosa), confounded the
plant now figured with a very different species. The confusion is,
however, fortunately limited to the remarks under the description,
and to the habitats g i v e n f o r the figure, and the whole
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