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Ser. R hodospeembæ. Fam. Rhodomelea.
P late CCXX.
R Y T I P H L Æ A F R U T I C U L O S A , Harv.
G b n . C h a e . Frond filiform or compressed, p in n a te , tran sv erse ly stria te ,
re tic u la te d ; th e axis a rtic u la te d , composed of a circle o f la rg e ,
tu b u la r, e lo n g a ted cells [siphons), s u r ro u n d in g a c en tra l c e ll; th e
p e rip h e ry of several rows of m in u te , irre g u la r, coloured cellules.
Fructification of tw o k in d s , on d is tin c t in d iv id u a ls ; 1, ovate cap
{ceramidia), co n ta in in g a tu f t of p e a r-sh ap e d spores ; 2 ,
co n ta in ed in m in u te lanceolate receptacles {stichidia), in a double row.
R y t i p h læ a {Ag .),— from pvTLs, a wrinhle, an d <¡>\otos, tb e hath;
because th e surface is tran sv e rse ly w rin k le d or s tria te .
RYTiPHLÆA/i-MÎiCiifos«; stem s diffuse, b ra n c h ed from th e b a s e ; b ran ch e s
d iv a ric a tin g p in n a to -d ich o tom o u s , set in tb e lower p a r t witb sh o rt,
ho rizo n ta l, m u ltifid ram u li ; in th e u p p e r m o re o r less p in n a te d w ith
la rg e r, similarly d iv id ed b ran ch le ts ; axils ro u n d e d ; ceram idia ovate,
sessüe, densely set ; te tra sp o re s in d is to rte d ram n li.
P olysiphonia fruticulosa, Spreng. Syst. Veg. vol. iv. p. 350. Buby, Bot.
Gall. p. 966. Harv. in Mack. Fl. Hib. part 3. p. 205. H a n . in Hook.
Br. Fl. vol. ii. p. 327 (in part). Harv. Man. p. 86. Wyatt, Alg. Banm.
no. 132. Mont. Crypt. Alg. n. 19. Fl. Alg. p. 81. Mont. Orypt. Canar.
p. 170. Fkdl. 3rd Suppl. p. 46.
P olysiphonia Wulfeni, Ag. Alg. Medit. p. 144. Kiitz. Phyc. Gen. p. 431.
H u tch in s ia fruticulosa, Ag. Syst. p. 27.
H u tch in s ia Wulfeni, Ag. Sp. Alg. vol. ii. p. 95.
G rammita Wulfeni, Bonn. Hyd. p. 27.
Ceeamium Wulfeni, Both, Oat. Bot. vol. ni. p. 140.
P ucu s fruticulosus, Wulf, in Jaeq. Col. p. 159. 1 .16. Crypt. Ag. p. 56.
F s p e r , Ic. Fuc. ^ .1 9 6 . i.3 1 . C/m. Ä s . p. 819. E. Bot. t.l9 3 9 . Turn.
Syn. Fuc. vol. ii. p. 394. Turn. Hist. t. 227.
H a b. I n pools left by tbe tide, growing on tbe rooky bottom, or on Corallines
and other small Algæ. Perennial. Summer. Common on the
western and southern shores of the British Islands.
Geo o e . D is t r . Atlantic and Mediterranean shores of Europe. Northern coasts
of Africa. Canary Islands.
De sc e . Boot a mass of creeping, entangled fibres. Fronds forming large, globose
tufts, often six inches in diameter, composed of a great number of
separate stems intertwined together. Stems 4 -6 inches long, twice as thick
as hog’s bristle, graduaUy attenuated upwards, branched from the base and
bushfo Main branches somewhat dichotomous, spreading at wide angles ;
the upper and small divisions repeatedly pinnate, or irregularly branched.
The lower branches are furnished with alternate, multifid ramuli, a line or
two in length and very patent ; the upper more regularly pinnate with
longer branchlets, which are set with simple or multifid subulate ramuli.
Every part of the frond is marked by dark-coloured transverse striæ, set at
2 B 2