BH0DTMSK1 U ll '"> 



the < t a 1 1 > of fructification, either erose or rounded ; tubercles 



n ssile, vi-rv convex, marginal or scattered ; t< tras] 

 eiate or tripartite, forming deep-red Bori in the expanded 

 apii B& L2 I -. PL \\\I\. 



Fig. L80.) 

 Sphserococcus Palmetta, Ag. Deleeseria Palmetta, La tr. II - 

 Lymenia Palmetta, QaiU. Fucus Palmetta, I , biii- 



dus, Hud*. 

 Hull. Atlantic shores o\' Britain. On rocks near the ^^•rL r ^' of low 

 water, and at a greater depth; but more frequently on the 

 Btemfl of Laminaria digUata. Annual. Summer and au- 

 tumn. Not uncommon. 

 Thifl pretty Bpecies, though it varies as to the greal 

 less division of the frond, generally preserves a tolerably 

 uniform, flabellate outline, which, taken in connection with 

 its bright pinky colour, and rather rigid, crisp Bubstance, 

 sufficiently distinguishes it from any other British Bpecies; 

 There are Borne closely allied forms in the Southern Ocean, 

 as R. corallina and R.Jlabelliformis, which it is sometimes 

 nrnre difficult to separate. Among British plants the near- 

 eel in form is Phyllophora membranifolia ; but this may 

 always be known by the very different colour, indepen- 

 dently of differences in the fructification. A marked dif- 

 ference exists between specimens which produce tetra- 

 Bpores, and those that hear tubercles. The former are in- 

 variably more expanded, with broad and rounded tips ; 

 the latter more drawn into a stem witli shorter and denser 

 ents, and truncate or abruptly cut tips. 



L80. cristata {The crested JZhodymenia) \ frond fan-shaped, 

 membranaceous, Bubdichotomous, the segments dilated up- 

 wards, repeatedly subdivided; lesser divisions alternate, 

 lineal-, laeiniate at the ends and often fimbriate at the 

 margin; tubercles spherical, marginal, sessile, Ghrev. Alg, 

 Brit. //. 89. (Atlas, PL XL. Fig. L84.) 



Callophylhs cristata, Ktz. Sphffirococcus cristatus, An. Pucus 

 cristatus, Herb. Linn. 1*. gigartinus, Fl. /■ 



//////. Growing on the roots and Btema of Laminaria in deep 

 water. Veryrare. Annual. July. 

 One of the raresl of the British Algae, almosi confined 



with us to the northern Bhores of Scotland, and the Orkney 



ami Shetland Islands, and in no place found in abundance. 



In general, British specimens are small, rarely attaining 



the size of that represented in our plate. Blost others 



which we posses are le>> than an inch in Length : some 



