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Ser. E hodospbemeæ.
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P l a t e CXLVII.
POLYSIPHONIA PARASITICA, Greo.
G e n .C h a u . Froml filamentous, p a rtia lly , or generally, a r tic u la te ; jo in ts
lo n g itu d in a lly stria te , composed of n um e ro u s ra d ia tin g cells or tu b e s,
disposed ro u n d a c en tra l cavity. Fructification Uvo-fold, on different
in d iv id u a ls ; 1, ovate capsules [ceramidia), imiMifcA vvitli a te rm in a l
pore ; and co n ta in in g a mass of pear-sliaped spores. 3 , tetraspores,
im b ed d ed in swollen b ran c lile ts. P o ly s ip h o n i a (Gru®.),— from »oXk,
many, a n d mfiav, a tube.
P o ly s ip h o n i a parasitica-, filaments slen d e r, n g id , fu ll-red , a lte rn a tely
b ra n ch ed , d is tic h o u s ; b ran ch e s b i- t r ipm n a te ; pinnules closely set,
e re cto -p a ten t, a lte rn a te , awl-shaped, acu te ; a rtic u la tio n s a b o u t as lo n g
as b ro a d , m a rk e d w ith th re e or fo u r b ro ad hex ag o n a l o blong ceUs (or
siphons) sep a ra ted by p e llu c id spaces ; siphons ab o u t e ig h t, su rro u n d in g
a na rrow c av ity ; capsules ovate, ou s lio rt s ta lk s ; te tra sp o re s im m
e rs ed in swollen p in n u le s .
P o l y s i p h o n i a parasitica, Grev. FI. Fdm. p. 309. w ''W h
vol ii p 330. Wyatt, Alg. Banm. no. 175. Harv. in Mack. FI. Hi .
part S. p. 8. Harv. Man. g. 36. Endl. 3rd Suppl. g. 4%.
H u t c h i n s i a p a r a s i t i c a , Ag. Syst. p . 147. Ag. Sp. Alg. v o l . i i . p . 103.
H u t o h i n s i a Mostingii, Tjyngh.Hyi. Ban. p. 116. t. 36.
CO N F EU V A p a r a s i t i c a , Huds. FI. Ang. g. 604. (?) Bilhv. Gonf. Syn. p . 87.
E .Bot. 1 .1429.
llAB. Parasitical on th e larger Algæ, and, much more frequently on various
species cclMelobeAa, at the limit of low water, and J “
fifteen fathoms water. Rather ra re ; b u t very generally d stribnted
on th e British coasts, from Orkney to Cornwall. Remarkably fine on
the Ayrshire coast, and at Arran, Rev. 1). Landsborough.
G e o g r . D i s t r . Atlantic shores of Europe, from the Foeroe Islands to Spam.
Malta, B r. Lyall.
D e sc b Fronds several from the same base, but not densely tufted, from one to
three inches in height, with an undivided or once-forked stem not quite so
thick as hog’s bristle, furnished throughout its length mth olosely-set
alternate, distichous branches. Branches very variable in length; in some
specimens not half an inch long ; in others, almost two inches, legnlaily
bi- or tripinnate ; the pinnæ gradually diminishing in length from the base
to the apex, closely set, erecto-patent, alternate ; pinnules fium half a line
to a l i T in length, ¿mple, subulate, alternate, acute. Sometimes the
branches are nearly naked, the pinnæ few, and ém g \j pinnate ! ^ ° '™ o ï
the base of the branches, in large specimens, the lower pinnæ aie shoit,
simple and recurved. Articulations of the pinnæ about as long as broad,
those ¿f the pinnules shorter, marked with several oblong tubes, which are
pointed at both ends, and separated by hyaline spaces. A transverse section
VOL. II .