DXVAi 187 



vulgaris Tht ■■ /' ' ■•■ ■ frond simple, Ianceo- 



. entire, the margin more or less wared, Ag. 

 p. is. (\ii LS, PL LWIV. Fig 

 Porphyra purpurea, Ag. P. linearis, Orev. CJlva purpurea 

 Jl<tl>. On rocks and Btones between tide-marks. Annual. Nearly 

 throughout the year. 

 This is distinguished from P. laciniata by being per- 

 fectly simple at all ages, instead ofbeing irregularly cloven ; 

 and by the much greater length of the frond in proportion 

 to its breadth. Both are equally common and widely 

 dispersed over the world, ami both indifferently may be 

 used in the preparation of marine Bauce, or Laver. The 

 is the more beautiful of the two, being 

 commonly of a much brighter colour than its congener, but 

 like it, the brilliancy varies according to the forward 

 tile fructification. 



xevm. BAXCIA. 



31o. fusco-purpurea (The hrovm-purple Bangui); filaments 

 elongated, simple, decumbent, nearly straight, here and there 

 constricted, forming a brownish-purple, l:1' >-.~\- stratum; 

 granules several in each transverse ban I, dark purple, I/yngh. 

 Hyd. Dan. p. 83. t 24. Atlas, PI. l.WIY. Fig. 34 

 Bangia atro-purpurea, Ag. B. versicolor, Ktz. Conferva fusco- 

 purpurea, fttro-purpurea, Both. 

 Hob. Common on the Bhores of England and Ireland, in many 

 plac 3. - nd planks in the Bea, within the tide- 

 range (also in fresh-water river- and canals). 

 Even those who agree in making B. Jusco-ptwjnirea the 

 typical sp< structure very differently j 

 some asserting thai this plan! is flat, others tubular but 

 piano-compressed, and others cylindrical. That the latter 

 Laracter becomes al once evident, by making a 

 transvi m of a filament, or, as i> nine]) more easily 

 done, by cutting ;i half-dry bundle of filaments into short 

 frustules, which, when moistened, will immediately exhibit 

 a circular wheel-like appearance. A curious point in the 



of B is, that it is found 



equally in the sea, and in fresh-water rivers and canals. 

 reaching an equal degree *>\' development and coloration 

 in either situation. Such an indifference is very unusual 

 among tic AJgse. 

 946. ciliaris (The fringe - i)j filaments gregarious 



