96 ACOTYLEDONS. ALGM. SpOTOchmiS. 



9. F. ceranoides, frond between coriaceous and membranaceous 

 with a central rib linear subdichotomous pinnated with nar- 

 row lateral scattered multifid fruit-bearing branches, recepta- 

 cles solitary terminal subcylindrical linear acuminated. Turn. 

 Hist. Fitc.'l. 89 (not Light/.}. 



HAB. Rocks by the shore near the castle of Aros in Mull, Mr. Turner 



and Hook. 

 About 1 foot long. 



10. F. ca?mlJculatus } frond coriaceous linear nerveless channelled 

 on one side dichotomous emarginate at the apices, receptacles 

 terminal oblongo-cuneiform turgid bipartite obtuse. Turn. 

 Hist. Fuc. t. 3. Lightf. p. 917. E. B. t. 823. 



HAB. Rocky shores, Isle of Bute,, &c., Lightf. Common in the Firth 



of Forth, Mr. Greviile. 

 Three to 6 or 7 inches long. Well marked by its grooved fronds. 



11. F. loreus., frond between cartilaginous and coriaceous com- 

 pressed linear nerveless entire at the margins dichotomous 

 arising from a peziza-shaped base, tubercles immersed in every 

 part and on both sides of the frond. Turn. Hist. Fuc. t. 196. 

 Lightf. p. 920. E. B. t. 569. 



.HAB. Sea-shores, not uncommon, Lightf. Dunbar, abundant, Mr. 

 Greviile. Westra, in Orkney, Mr. Neill. 



From 2 10 feet long. The young plants have a curious appearance, 

 are about an inch long, subgelatinous, turbinate, at length peziza- 

 shaped ; covering the rocks at low water for a great extent. Some 

 I have seen on exposed rocks, probably from the effect of the sun, 

 swollen into a large, hollow, perfectly sphserical ball. 



22. LICHINA. Ag. 

 Fruit : a tubercle perforated at the extremity, at length scutelli- 



form. Habit shrubby and somewhat that of a Lichen. 

 1. L. py graced, frond cartilaginous compressed dilated upwards 



nerveless dichotomous, at its extremities palmated with very 



short truncated segments, tubercles terminal sessile sphaerical 



perforated at the tips. Ag. p. 9. Fucus pygmceus, Lightf. 



p, 964. /. 32. Turn. Hist. Fuc. t. 204. E. B. t. 1332. 

 P. minor, frond nearly cylindrical. Turn. Stereocaulon confine, 



Ach. Meth. Lich. II. p. 317. 

 HAB. Rocks, not uncommon, at low water. First discovered by Mr. 



Lightf oot in Scotland, and described by him. /3. Rocks at Dunbar, &c. 

 i to ^ an inch high, black. 



23. SPOROCHNUS. 



Fructiferous tubercles terminated by a pencil of hairs. The type 

 of this genus is the English Fucus pedunculatus. Frond fili- 

 form, cartilaginous. Fruit oval or globose, with a pencil of 

 conferva-like jointed deciduous threads at the extremity, within 

 filled with concentric fibres, each terminated by a globule. 



1. S. aculeatiiSy frond cartilaginous rounded very much branched, 



