ACOTYLEDONS. ALGJE. CladoStCpkuS. 89 



This is said to reach to the length of a foot or a foot and a half. The 

 branches are however very slender, and the ultimate ones collected 

 into numerous broad fascicles, which give the whole plant a singular 

 appearance. Fruit either capsular, or seeds longitudinally arranged 

 in the ultimate branchlets. 



8. H. arluscula, primary filaments incrassated with the joints 

 obsolete, above very much branched reddish purple, branch- 

 lets crowded subverticillate abbreviated multifid patent, with 

 the articulations about as long as they are broad. Dilliv. 

 Conf. t. 85, and /. G. E. B. 1. 1916. * 



HAB. Shores of Orkney and Caithness, Mr. Borrer and Hook. Firth 



of Forth, Mr. Arnott and Mr. Greville. 

 This beautiful species is about 2 or 4 inches long, very delicate, deepish 



rose-colour. Two kinds of fruit have been found upon it, sessile 



capsules and swollen extremities of the branches with a double row 



of seeds. 



9. H. coccinea, scarlet, filaments subcartilaginous very much 

 branched hairy below, branches alternately doubly pinnate, 

 the ultimate ones tufted, joints rather obscure about as long as 

 they are broad. Conferva coccinea, E. B- 1. 1055, Dillw. 

 Conf. t. 36. Conf. plumosa, Lightf. p. 996. 



HAB. It appears to be rare in Scotland. Lightf oot says that fragments 

 of it were found on the western coast. Mr. Greville has gathered it 

 in the Firth of Forth, near Kirkcaldy. Most allied to the last species, 



17. CLADOSTEPHUS. 



Filaments jointed, the primary ones solid. Branches of a differ- 

 ent structure from the main stem, mostly whorled at the joints, 

 Fruit capsular. 



1. C. verlicillatus, filaments dichotomous branched cartilaginous 

 thick olive brown, branchlets verticillate incurved very short 

 generally forked, articulations shorter than broad. Conferva 

 verticillala, Lightf. p. 984. Dillw. Conf. t. 55. E. B. 

 1. 1718. 



HAB. Among the sea rocks in basins of water left by the tides, in the 

 Firth of Forth, and many other places, not unfrequent, Lightf. 



Four or six inches long. Fruit, according to Smith, oblong pedun- 

 culated capsules proceeding from the ramuli. 



2, C. spongiosus, " filaments branched cartilaginous thick oliva- 

 ceous, branchlets simple very short scattered and imbricated 

 on all sides, articulations about half as long again as broad." 

 Dillw. Conferva spongiosa, Dillw. Conf. t,42. E.B. t.2427. 

 Lightf. p. 983. 



HAB. Among the sea rocks in tlie Firth of Forth, and many other 



places, Lightf. 

 About 3 inches long, irregularly branched, Capsules like those of 



C, verti/cillatus. 



