i L a u ( ï ' . r r / j .
P l a t e CCXCIX.
POLYSIPHONIA FASTIGIATA, Grev.
G e n . Ch a r . Frond filamentous, partially or generally articulate ; articulations
longitudinally striate, composed of numerous, radiating cells or
tubes, disposed round a central cavity. Fructijication twofold, on
different individuals : 1, ovate capsules {ceramidia) furnished with a
terminal pore, and containing a tuft of pear-shaped spores ; 2, tetraspores,
imbedded in swollen branchlets. P o ly s ip h o n i a (Grev.),—
from iroXvf, many, and a-ffiav, a tube.
P o lys iph o n ia fa s tig ia ta ; filaments rigid, setaceous, of equal diameter
throughout, forming globular, fastigiate tufts, many times dichotomous;
the axils patent; articulations shorter than their diameter,
multistriate, with a dark central spot ; siphons from sixteen to
eighteen.
P o l y s i p h o n i a fastigiata, Grev. M. Editi, p. 308. Harv. in Hook. Br. El.
vol. ii. p. 333. Harv.in Mack. M. H i i . 'ÿ s rt3 .-ÿ .2 ü 'i. Harv. Man. e i. 2.
p. 92. Wyatt, Alg. Banm. no. 177. Endl. 3rd Suppl. p. 45. Kütz. Sp.
Alg. p. 809. Kütz. Phyc. Gen. p. 420. t. 50. f. 3.
H u t c h i n s i a fastigiata, Ag. Syn. p. 53. Hook. El. Scot. part 2. p. 87. Ag.
p. 154. Lyngb. Hyd. Ban. ] > . l 3 3 . t . 3 3 . Ag. Sp. Alg. Y o l . i i . 3 1 .
C e r a m i u m fastigiatum, Roth, El. Germ. vol. iii. p. 463. Cat. Bot. vol. iii.
p. 157.
C o n f e r v a polymorpha, Innn. Syst. Nat. vol.ii. p. 721. El. Ban. t. 393.
B ilim. Muse. t. 6. fig. 35. Ellis, Phil. Trans, vol. Ivii. p. 426. t. 18.
fig. a. A. b. B. Huds. El. Angl. vol. ii. p. 599. lig h tf. El. Scot. vol. ii.
p. 989. Billw. Conf. t. 44. E. Bot. 1 .1764.
F u cu s lanosus, Linn. Syst. Nat. vol. ii. p. 718. Huds. El. Ang. vol. ii. p. 590.
H ab. Parasitical on the littoral Fuci, especially upon Fucus nodosus.
Perennial. Summer and autumn. Very uncommon.
G e o g r . D i s t r . Atlantic s h o r e s o f E u r o p e a n d N o r t h America. Baltic Sea.
D e s c r . Root a minute disc. Eronds foi-ming dense, globular, fastigiate tufts,
from one to two or three inches in diameter. Eilaments as thick as horsehair
below, slightly attenuated upwards, excessively branched from the
base, dichotomous, either bare of lateral ramuh or furnished with a greater
or less number, which are short and once or twice forked. Apices spreading,
of nearly equal length, subulate; axils acute. Articulations shorter
than their length, with hyaline dissepiments, many-striate and marked
with a dark, central spot, being a bag of coloured endochrome vyhich fiUs
the central tube or cavity of the frond ; radiating cells from sixteen to
eighteen. Capsules ovate, near the tips of the branches, formed from the