72 SYNOPSIS OF BRITISH SEAWEEDS. 



vein- and more or Less obsolete, H'irr. fa Hook. Br. Ft. r. 2. 



p. 333. (Atlas, PL XXIV. Fig. L06 and L06.) 

 Polysiphonia Etachingeri, ./. Ag. V. rosea, Grev. P. stenocarpa, 

 Kg. P. chalarophlssa, Kg. P. clavigera, 7w/. Hutchinsia 

 elongata, J#. H. Ruchingeri, Ay. Ceramium elongatum, 

 Ruth. C. brachygonium, Lyngb. Conferva elongata, Hints. 

 Hah. Common on stones and shells, in pools between tide- 

 marks, and attached to oyster and scallop-shells, etc., in 

 5-10 fathoms water. Perennial, or at least biennial. Spring 

 and summer. 

 Fig. 105 of the Atlas represents the ordinary form of P. 

 elongata (Lohster-horns) in plants of the first season, and 

 Fig. 106 a plant of the second year's growth. In winter 

 the tips of the branches and ramuli of the first year fall 

 away, leaving a stunted and broken frond, very unsightly, 

 and often distorted. Early in spring, new growth com- 

 mences ; the broken branches put forth vigorous shoots, 

 ending in broad pencils of crimson ramuli, which in a short 

 time clothe the whole upper part of the frond in the rich cos- 

 tume which we have endeavoured to portray. These differ- 

 ent aspects of the species are puzzling to a young observer. 



115. violacea (The violet Polysiphonia) ; browmish-red or pur- 

 ple ; stem inarticulate, marked with irregular ceUs, rather 

 robust, alternately branched ; branches quadrifarious, decom- 

 posed, bushy or feathery, the ultimate ramuli exceedingly 

 slender, alternately multifid, fibrilliferous ; articulations of 

 the ramuli bi-striate, two to four times longer than broad ; 

 siphons four ; capsules ovate, pedicellate or sessile ; tetra- 

 spores in swollen, sub-monihform ramuli, Grev.; JVyatt, 

 Alg. Danm. no. 176. (Atlas, PI. XXVII. Fig. 119.) 

 Hutchinsia violacea, Ay. 



Sab. Shores of North Britain. On rocks and stones, and on 



the smaller Algae, near low- water mark. Annual. May and 



June. Not uncommon. 



A very beautiful species, in many respects resembling 



P.fibrata, especially in the appearance that small portions 



present to the microscope ; but this is a much larger and 



more luxuriant plant, and readily and clearly distinguished 



by the opaque stem, coated with short, irregular cells. In 



seme specimens the byssoid ramuli are much developed, 



and of a beautiful violet colour, especially when dried ; in 



others they are far shorter, and the frond has a more bushy 



appearance. In a young state the tips are found clothed 



with fibres, but these are rarely seen in the more advanced 



stages of grow th. 



