RHODOMBLAI I i . C7 



106. fruticulosa (The shrubby Evtiphlata) •. the sterna diffuse, 

 branched from the base; branches divaricating, pinnate* 

 dichotomous, set in the lower pari with short, horizontal, 



iiiultitiil ramuli; in the upper mure (ii- Leas pinnated with 

 larger, similarly divided branchiate; axila rounded; oera- 

 midia ovate, Bessile, densely Bel ; tetrasporea in distorted 



ramuli, HotV. Phy. Brit. pi. 22<>. (ATLAfl, PL Will. 



I b L02.) 

 Polysiphonia fruticulosa, Spreng. P. Wulfeni, Ag. Hutchinsia 



fruticulosa, Ag. EI. Wulfeni, Ag. Gfoimmita Wulfeni, Bonn. 



Ceramium Wulfeni, Roth. Fucus fhiticulosus, Wulf. 

 Hah. \w pool- left by the tide, growing on the rocky bottom, or 



on Corallines and other small Alg©. Perennial. Summer. 



Common on t lie western and southern Bhores of the British 



Islands. 

 Some specimens of JR. fruticulosa arc very close to some 

 of R. thuyoides, and the latter, in like manner, closely ap- 

 proaches narrow states of R. complanata. So nearly QO 

 they approach, that at one time I regarded litem ail as 

 merely sportive forms of one species, but this was before 

 1 had much opportunity of studying them in a living state. 

 When growing, each possesses characters sufficiently ob- 

 vious. It is only in a few cases oi' imperfect or badly dried 

 specimens thai the student will fiud it difficult to decide 

 to which species the specimen should be referred. The 

 ceramidia of this species are not often found, but when 

 they occur they are generally formed in profusion, almost 

 every twig bearing one or two. They are always borne 

 on less luxuriant specimens tkan those which yield tetra- 



\!. POLYSIPHONIA, 



10G. urceolata (Thr pitchered Polysiphonia) ; filaments rigid, 

 setaceous, full-red, much branched, Loosely bundled ; branches 

 dichotomous, more or Less furnished with short, alternate, 

 patent or recurved ramuli; articulations marked with two 

 broad tubes, those of the main branches 3-5 times Longer 

 than broad; Biphons four, surrounding a minute e 

 capsules pitcher-shaped, with a produced mouth, generally 

 stalked; tetrasporea in the upper pari of the ramuli, 6 

 /•v. Bain. p. 309. ^.tlaa, PL \\\ . Pig, L09.) 



Polysiphonia patens, Harv. Eutohinsia orceolata, Hook. IT. 

 patens, Ag, Conferva orceolata, Dill I is, Dillw. 



Ltlantic Bhores of North Britain. On rocka near low- 

 water mark, and on the -tern- of Z I dnjltala. 



