LICHINA. | LICHINEI. 31 
Tribe I. LICHINETI Nyl. Mém. 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 moniliform, subconnate. Apothecia 
small, lecanorine, lecideine or sub-biatorine, paraphyses slender or 
thickish ; spores 8nz, ellipsoid, simple or septate. Spermogones 
tuberculose, with simple sterigmata or jointed sterigmata. 
The principal characteristic of this tribe is to be found in the gonimia 
being moniliformly arranged through long series. They are also much less 
connate than in Gontonema, so that the affinities of the tribe are rather with 
this family. Of the four genera of which it is composed, only one is at 
all common in Great Britain. 
8. LICHINA Ag. Syn. Alg. (1817) p. xii; Tul. Ann. Se. Nat. 
sér. 3, xvii. (1852) p. 87; Nyl. Syn. p. 88.—Thallus fruticulose, 
cartilaginous, dichoto- 
mously branched, within 
parallelly lineari-cellu- 
lar; gonimia arranged 
chiefly under the cortical 
layer, bluish or glaucous- 
bluish. Apothecia ter- 
minal, in globose thalline 
receptacles, lecanorine ; 
spores simple, colourless ; 
paraphyses slender, not 
crowded ; hymenial gela- 
tine not coloured with 
iodine. Spermogones 
terminal, with simple 
long sterigmata and ob- 
long spermatia. 
ad 
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 barren marifime rocks. 
It is in various respects Fig. 5. 
somewhat parallel among Lichina pygmea Ag.—a. Section of apothecium 
the Collemacei to Sphero- (1) and of a spermogone (2), x30. 6. Section 
phorus amongst the Li of thallus, 200. ¢. Gonimia, x 350. d. Theca 
chenacei. The apothecia nd paraphysis, x 350. ¢. Two spores, x 500. 
are truly lecanorine, though f. Steriginata and spermatia, x 500. 
pyrenodean in appearance, while the spermogones are often situated 
around them. 
1 
