Tah.KrV
Keevu. jinp.
Ser. R h o d o s p e k m e .e . Fam.
P late XCV .
POLYIDES ROTUNDUS, Grev.
G e n . C h a u . Root an expanded disc. Frond cylindrical, diohotomous, cartilaginous,
solid, the axis consisting of densely packed, longitudinal,
interlacing and anastomosing filaments; the periphery of coloured,
horizontal, dichotomous filaments, whose lower half is composed of
large, eUiptical ceUs; their upper of much smaUer, submoniliform
oeUules. Fructification, of two kinds, on distinct individuals; 1,
oblong, irregularly formed, external warts, composed of dichotomous
filaments, through which are scattered eUiptical favellæ, having a
broad peUucid Umhus. 3, cruciate tetraspores immersed, at intervals,
among the filaments of the periphery. P o l y i d e s {Ag),—from ttoXu,
many, and ¡Sea, form or appearance ; a name iU applied to the present
genus.
Hook. Brit. M. vol. ii.
; Mack. FI. Hii. part 3.
it. Alg. p. 194.
P olyides
P o l y id e s rotundus, Grev. Alg. Brit. p. 70. 1 .11.
p. 284. Wyatt, Alg. Banm. no. 161. Harv. it
p. 190. Harv. Man. p. 43.
P o l y id e s lumbricalis, Ag. Sp. Alg. vol. ii. p. 392. Ag. Sy
Spreng. Syst. Veg. vol. iv. p. 344. Endl. 3rd Suppl. p. 38.
S po n g io o a b pu s ro tu n d u s , Grev. El. Edin. p . 2 8 6 .
PuiiCELLARiA rotunda, Lyngb. Hyd. Ban. p . 4 9 .
PuaoELLABiA Inmbi'icaUs, Kiitz. Fhyc. Gen. p. 402. t. 72.
C h o k d a u ia ro tu n d a . Hook. El. Scot. p a r t 2. p . 9 7 .
G ig a k t in a rotunda, Zamour. Ess. p. 49.
P uous rotundus, Gm. Hist. p. 110. t. 6. f. 3. (excl. syn. Huds. and Baii.)
Unn. Syst. Nat. Gm. p. 1383. With. vol. iv. p. 110. Turn. Syn. Eue.
vol. ii. p. 309. Turn. Hu t. t. 5. E. Bot. 1 .1133.
PuoDS ra d ia tu s . Good, and Wooivi. in Unn. Trans, vol. iii. p . 2 0 2 , Stack.
Ner. Brit. p . 8 9 . 1 . 1 4 ,
Puous caprinus, Gunn. El. Norv. vol. 1. p. 96.
P u cu s fastigiatus. Herb. Unn. {sec. Turn.) Esper, 1 .16 {excl. syn.).
H a b . On rocks in pools, within the tide range. Perennial. Winter.
Frequent on the shores of England and Ireland. Jersey. Miss White
and Miss Turner. Eare in Scotland? Appin, Capt. Carmichael.
Dumfries, Sir J. Richardson. Frith of Forth, Mr. Maughan, Mr.
Stewart, Br. Greville. Aberdeen, B r. Bickie. Orkney, Rev. Mr.
Clouston, Rev. Mr. FoUexfen, Lieut. Thomas, Br. Me’Bain. Ardrossan,
Major Martin, and Rev. B . Landsborough.
G e o g e . D i s t e . Atlantic shores of Europe from Iceland to Prance (and Spain?).
Atlantic shores of North America. Boston, Mr. Emerson. New York,
Frof. Bailey. Adriatic Sea, W u lf en (omitted by J. Agardh).
D e s c e . Boot a fleshy, flattened, circular disc, half an inch or more in diameter.
2 B
' m