230 CRYPTOGAMIA 



2. D. sinuosa, stalk cylindrical, branched; leaves oblong, sinuate 

 or pinnatifid, transversely veined, the margins spinous; seed- 

 leaflets linear HOOK. Scot. ii. 100. GREV. Alg. Brit. 73. Fucus 



sinuosus, WITH. iv. 103. F. rubens, LIGHT r. Scot. 943. 



Hab. Rather rare on the immediate coast, and only amongst 

 sea refuse, but more common to the north of Berwick- 

 shire, growing on the stems of Laminaria digitata. 



3. D. alata, stalk linear, flattened, dichotomously branched, 

 much divided towards the extremities, winged throughout with a 

 narrow veinless membrane ; seed-leaflets lanceolate, mostly at the 

 apex of the segments. HOOK. Scot. ii. 100. GREV. Alg. Brit. 74. 

 Fucus alatus, LIGHT. Scot. 951. WITH. iv. 104. 



Hab. On the stalks of Laminaria digitata, common. 



Of a dark red-rose colour, 3 or 4 inches high. The lateral 

 membrane is often worn away by the action of the waves. 



131. ODONTHALIA. 



1. O. dentata, " frond branched, spreading, the branches dis- 

 tichous, alternately pinnatifid, pinnulse toothed at their apex ; 

 capsules ovate, pedunculate, panicled, in axillary clusters." 

 GREV. Alg. Brit. 101. Fucus dentatus, LIGHTF. Scot. 952. WITH. 

 iv. 112. Spharococcus denlatus, HOOK. Scot. ii. 102. 



Hab. Coast of Berwickshire, not uncommon. 7/ 



132. CHONDRUS. 



1 . C. mammillosus, frond dichotomous, channelled on one side ; 

 segments elongate, wedge-shaped, entire, covered on both sur- 

 faces with numerous small wart-like tubercles. GREV. Alg. Brit. 

 127. Fucus mammillosus, WITH. iv. 107. F. ceranoides g, LIGHTF. 

 Scot. 916. Sphterococcus mammillosus, HOOK. Scot. ii. 102. 



Hab. On rocks, in tufts about 3 or 4 inches high. 7f 



2. C. crispus, frond dichotomous, plane, the margin entire ; seg- 

 ments spreading, linear, with bifid apices ; capsules subhemisphe- 

 rical r imbedded in the disk of the frond GREV. Alg. Brit. 129. 



