VII. LICHENES. 
581 
31. CfENOGONIUM, Ehrenb. 
Thallus effuse, of subcontinuous, pellucid, obscurely-articulate filaments, 
forming a cottony, loosely-interwoven, greenish web. Apothecia orbicular, 
substipitate, without a border, or margined in the young state only, the disk 
bearing asci. 
A small genus common in warm climates, on hark of trees, remarkable for the Conferva- 
like structure of the thallus. 
1. C. Linkii, Ehrenh. ; — Bab. in FI. N. Z. ii. 310. Thallus suborbi- 
cular, glaucous green. Apothecia saffron-yellow; spores elliptic-ovate, in 
one series within the filiform subclavate asci. — Fee, Meth. Lich. 63. t. 2. 
Northern and Middle Islands: common on trees, etc., Menzies, D’Urville, etc. 
(Cosmopolite in tropical and subtropical countries.) 
C. inflexion, Nyland., is enumerated amongst Lindsay’s Otago Lichens. 
32. BYSSOCAULON, Mont. 
Thallus filiform, spreading, formed of excessively-branched fibres, which 
are not articulate, and are crisped when dry. 
A very anomalous genus, recently regarded by its author, Montagne, as a form of Pan- 
naria. (See Mout. Sylloge, Plant. Crypt. 293.) 
1. B, filamentosum, Nyland. ;—Farmelia gossypina, var. Jilameulosa, 
Bab. in FI. N. Z. ii. 288. Thallus forming a white cottony stratum. 
Northern Island, Colenso, on moss, barren. (Juan Fernandez.) (I find no specimens 
in the Herbarium.) 
33. LECIDEA, Acharius. 
Thallus crustaceous, scaly, granular, powdery or 0. Apothecia with a 
margin of their own substance or 0. Spermagonia with straight (rarely 
curved) or acicular or shortly cylindric spermatia. 
A very large genus, found in all parts of the world, 
§ 1. Apothecia concave, bright-coloured (Gyalecta, Ach.). 
1. L. cnpularis, Acli. — Gyalecta , Bab. in FI. N. Z. ii. 294. Thallus 
pale, thin, scattered, ashy or whitish. Apothecia subglobose, salmon-coloured, 
at length urceolate, with a pale, flesh-coloured, thick, elevated, indexed, often 
crenate and pulverulent border; spores ellipsoid, 3-septate. — Nyland. Lich. 
Scand. 190. 
Northern Island : on stones, probably common, and as far south as Xjord Auckland’s 
group. (Europe, America, Tasmania.) 
2. L. carneola, Ach. Thallus mealy, thin, white, or obsolete. Apo- 
thecia small, dusky or brownish, suburceolate, with a thick elevated even 
smooth paler border ; spores acicular, many-septate. — Nyland. Lich. Scand. 
191. 
Northern Island : on bark, Colenso. (Europe, America.) 
