170 ALGtJE MELANOSPERME;E. [Lichina. 



I. H. lorea, Lyngb. Strap-shaped Himanthalia or Sea- 

 thongs. Hook. Br. Fl. v. ii. p. 269. Turn. Hist. t. 196. 



Rocky shores. Fronds one or two inches high, perennial, emitting 

 receptacles from two to ten feet in length, which fall off annually. 



TRIBE II. LICHINE^E. 



Marine plants of a blackish green colour, changing to black in the 

 air ; cartilaginous, minute, without distinct leaves. Fructification : 

 receptacles furnished with a terminal pore, " and filled with a 

 colourless gelatinous mass of very Jine Jilaments, among which 

 pellucid oval or oblong seeds are disposed in many radiating monili- 

 form series" Grev. I am not at all satisfied about the true 

 situation of this small tribe, but place it immediately after the 

 Fucoideaa in compliance with the ideas of my valued friend Dr. 

 Greville. In many respects, especially in the structure of the 

 capsules or receptacles, it approaches some genera of Lichenes. 



5. LICHINA. Ag. Lichina. 



Frond cartilaginous, blackish-green, dichotomous. Fruct. : 

 roundish capsules (receptacles) of the same colour, contain- 

 ing radiating moniliform lines of pellucid seeds, imbedded in 

 a gelatinous mass of filaments. Grev.- Name ; an alteration 

 of Lichen, to which tribe this bears a great resemblance. 



1. L. pygmcea, Ag. Dwarf Lichina. . Frond between flat 

 and compressed ; capsules globose. Grev. Hook. Br. Fl. v. ii. 

 p. 270. E. JBot. t. 1332. 



Rocks uncovered at low water mark, common. Forms little roundish 

 tufts, about half an inch in height. Fronds crisp, dark green. 



2. L. confinis, Ag. Least Lichina. Frond cylindrical ; cap- 

 sules terminal, oval. Grev. Hook. Br. FL v. ii. p. 270. E. 

 Sot. t. 2575. 



Rocks, near high water mark, not rare. Smaller than the last, and of 

 a darker colour. Dr. Greville has taken much pains to distinguish this 

 from the preceding, and has figured both admirably in his beautiful 

 Crypt. Flora (t. 219 and 221) ; but I rather incline to Dr. Hooker's 

 opinion, that their distinguishing characters depend on difference of 

 locality. 



TRIBE III. LAMINARIE^. 



Plants marine, of an olive-brown or olive-green colour, becoming 

 rather darker on exposure ; coriaceous or membranaceous, jibroso- 

 cellular, not reticulated. Root lobed or fibrous. Frond stipitate, 

 terminating in a leaflike expansion which is often cleft, and occasion- 



