POLYSIPHONIA. 91 



with scattered, subulate, simple, patent ramuli ; articulations 

 as long as broad, multi-striate ; siphons about thirteen. 

 Harv. in Hook. Journ. 13ot. p. 301 ; Wyatt, Alg. Danm. No. 

 178; Harv. Phyc. Brit. t. ccxxvii. Hutchinsid subulifera, 

 Ag. Sp. Alg. ii. p. 97. 8. Templetoni ; more slender, the 

 joints 2 or 3 times longer than broad. 



In deep water; very local. Annual. Summer. Torquay, Mrs. Grif- 

 fiths. Weymouth, between tide-marks, Miss White. $. Belfast Bay, Mr. 

 Templeton and Mr. W. Thompson. Carrickfergus and Roundstone Bay, 

 Mr. McCalla. Filaments 4 or 5 inches long, as thick as hogs' bristles, 

 attenuated upwards, subdichotomous or irregularly branched ; branches di- 

 varicating, flexuous, long, subdivided, beset at distances of 1 or 2 lines with 

 very short, scattered, spine-like, patent, acute, simple, or rarely subpin- 

 nated ramuli, the pinnulae extremely short. Articulations of the branches 

 as long as broad, 4 6 striate, the striae straight and slender ; of the ramuli 

 shorter than broad ; dissepiments opaque. Substance tender and flaccid. 

 Colour purplish. /3. which I find among the late Mr. Templeton's plants 

 under the name of Conf. spinifera, and which I have also received from Mr. 

 Thompson, differs from the Devonshire specimens in being more slender, 

 the ramuli shorter, more patent and spine-like, with the joints 2 or 3 times 

 longer than broad in the main stems, but variable in this respect. Mr. 

 Thompson's specimens are more robust, and have shorter joints than Mr. 

 Templeton's, thus approaching the Devonshire plant. Nearly related to 

 the following, but with a more patent branching. 



22. P. atro-rubescens, Dillw. ; filaments sparingly or much 

 branched, somewhat rigid, dark brownish-red ; branches 

 long, alternate, very erect, furnished with short, sub-fascicu- 

 late or scattered, subulate ramuli ; articulations variable ; the 

 lower, 2 or 3 times, the upper, once and a half as long 

 as broad, marked with several spirally curved tubes ; siphons 

 about thirteen ; ceramidia ovate, stalked or sessile. Harv. 

 in Hook. Br. Fl. ii. p. 331 ; Harv. Phyc. Brit. t. clxxii. 

 Con/, atro-rubescens, Dillw. t. 70. Conf. nigra, E. Bot. t. 

 2340. P. Agardhiana, Grev. Crypt, t. 210, and Harv. I. c .\ 

 Wyatt, Alg. Danm. No. 134. Also P. badia and P. denu- 

 data, Grev. and Harv. I. c. 



On rocks in the sea ; not uncommon. Perennial. Summer and autumn. 

 Stems densely tufted, or covering the rocks in wide patches, 2 6 inches 

 high, thicker than horsehair, sub-simple, more or less furnished with long, 

 alternate, erect, simple branches, which sometimes bear a second series, and 

 are in greater or less abundance clothed with short, subulate, or spindle- 

 shaped, erect ramuli. The joints vary considerably in length, but seldom 

 exceed thrice their diameter. The tubes are very frequently, but not con- 

 stantly, spirally curved. Colour deep red or brownish, becoming blackish 

 in drying. Substance rigid, not adhering or but slightly to paper. Capsules 

 with a very wide aperture, subglobose. With consent of Dr. Greville and 

 Mrs. Griffiths, I gladly unite P. Agardhiana, badia and denudata, with the 

 present species. 



