74 BTNOP8I8 OF BRITISH SEAWEEDS. 



118. Brodiaei (Brodie's PoUftiphonia) \ Btemfl inarticulate, ro- 

 bust, cartilaginous, alternately branched; branchet rirgate 

 clothed with spreading, pencilled, multifld, delicate, m 

 ramuli; articulations of the ramnli three or four tubed, rather 

 longer than broad ; siplions in the stem about seven, sur- 

 rounding a narrow cavity; capsules ovate, pedicellate, or 

 subsessile; tetraspores in the swollen tips of the multifld 

 ramuli, Gfrev.; Harv. in Hook. Br. Ft. v. 2. p. 328. (Atlas, 

 PL XXVII. Fig. 120.) 



Hutchinsia Brodicei, Lyngb. H. penicillata, Ag. Conferva Bro- 



cliaei, Dillw. Ceramium Brodiaei, Ag. 

 Hah. Common on the rocky shores of Scotland ; of the south of 



of England, and south and west of Ireland ; and of the 



Channel Islands. On rocks and Corallines near low-water 



mark. Annual. Summer. 

 This is one of the handsomest, as it is one of the largest of 

 the British species of JPolysiphonia, and easily recognized, 

 except occasionally from some specimens of JP.fruticulosa, 

 by its peculiar habit. The inarticulate stem, and long, 

 simple, robust branches clothed with pencils of delicate 

 filaments, strongly mark the species. T. Brodicei is now 

 ascertained to be common on all the northern shores of 

 Europe as well as on the eastern shores of North America. 



119. variegata (The variegated Polysiphonia); filaments brown- 

 ish-purple or greenish, setaceous, and rigid below, gradually 

 attenuated upwards to a capillary fineness, dichotomous, the 

 lower axils very patent ; branches somewhat zigzag, elongated, 

 much divided, set with lateral, capillary, and very flaccid, 

 multifid, purple ramuli ; articulations near the base shorter 

 than their breadth, twice as long as broad in the principal 

 branches, and gradually becoming shorter upwards, marked 

 with three broad, parallel, oblong cells, separated by pellucid 

 spaces ; tubes six or rarely seven, surrounding a minute ca- 

 vity ; capsules ovate, on a short stalk, J. Ag.Alg. M. p. 129. 

 (Atlas, PL XXVIII, Fig. 124.) 



Polysiphonia peucedanoides, Mont. Hutchinsia variegata, Ag. 



Gramita peucedanoides, Bonnem. 

 Hdb. On mud-covered rocks in bays and estuaries, also on Zos- 

 ter a^ Chorda fdum, floating timber, etc. Annual. Summer 

 and autumn. Various places near Plymouth. Very local. 

 No species need be more distinct than this is. Its habit 

 is very like that of P. elongella, it is true, but the purple 

 colour affords an obvious character; while the six tubes of 

 the stem furnish an important distinction from that and 

 all other British species yet known. The favourite locality 



