LICHINA.] 



UCmNEI. 



31 



Tribe I. LICHINEI Xyl. Mem. Soc. Cherb. ii. (1854) p. 8; 

 Syn. i. p. 88, Stiz. St* Gall. Nat. Ges. 1876, p. 193. 



Thallus small, fruticulose or radiato-laciniate, firm or fragile ; 

 gonimia elongato - seriately monilitbrm, subconnute. Apothecia 

 small, leeanorine, leeideine or sub-biatorine, paraphyses slender or 

 thickish ; spores 8nae, ellipsoid, simple or septate. Spermogones 

 tuberculose, with simple sterigraata or joiuted sterigmata. 



The principal cbaracteristic of this tribe is to be found in the gonimia 

 being nionilifornily arranged through Ion? series. They are also much less 

 connate than in Goniunema, so that the affinities of the tribe are rather ■^\-ith 

 this family. Of the four genera of which it is composed, oulv one is at 

 all common in Great Britain. 



.^^^^ 



8. LICHINA Ag. Syn. Alg. (1817) p. xii ; Tul. Ann. So. Xat. 

 ser. 3, xvii. (1S52) p. 87; Xyl. Syn. p. 88, — TbaUus fruticulose, 

 cartilaginous, dicboto- 

 mously brancbed, within 

 parallelly lineari-ceUu- 

 lar ; gonimia arranged 1 

 chietiy under the cortical 

 layer, bluish or glaucous- 

 bluish. Apothecia ter- 

 minal, in globose tbaUine 

 receptacles, leeanorine ; 

 spores simple, colourless ; 

 paraphyses slender, not 

 crowded ; bymenial gela- 

 tine not coloured with 

 iodine. Spermogones 



terminal, with simple 

 long sterigmata and ob- 

 long spermatia. 



This small genus, though 

 fucoid in appearance, be- 

 longs in all essential cha- 

 racters to Lichens. The 

 few species of which it 

 consists are strictly social 

 in their habit, and often 

 extensively cover the other- 

 wise ban-en maritime rocks. 

 It is in various respects Fig. 5. 



somewhat parallel among Lkhina pi/gmaa Ag. — a. Section of apothecium 

 the Colkmocei to Sphtero- (1) and of a spencogone (2), XoO. b. Section 

 phoriis amongst the Li- of thallus, x2llO. r. Gonimia, x 350. c?. Theca 

 chcmicei. The apothecia and paraphysis, x 350. e. Two spores, X 50(J. 

 are truly lecanorine,though >• Sterigmata and spermatia, x.500. 

 pyrenodean in appearance, while the spermogones are often situated 

 around them. 



