295 
tum, thalli ramulis exfremis in discaum dilatatis insidens (fbrillis thal- 
lodeis radiatam), cum thallo subceoncoler, vel carneo-pallidum. 
1. Usnea Dill. Lich. barbatus Linn. 
IL Cornieularii. Thallus filamentosus vel lineari-laciniatus, 
erectus vel pendulus, undique concolor. Apothecium: excipulum thal- 
lodeum,, orbieulatum, thalamium colore varium. 
2.CorniculariaSchreb. Thallus filamentosus, tereti-compres- 
sus vel lineari-laciniatus et lacunosus, strato corticali eartilagineo ob- 
duetus. Apothecium: exeipulum subpedicellatum; thalamium colore 
varium, nudum. Lich. ochroleucus Ehrh. 
3. Roccella DC. T’hallus teres vel loreus, aequabilis, erectus 
vel pendulus, strato corticali erustaceo obductus. Apotheeium: ex- 
eipulum thallo innatum ; thalamium strato thallodeo primum velafum, 
dein denudatum, nigrum. — Lich. fuciformis Linn. 
4. Ramalina Ach. Thallus lineari-laciniatus, utrioque Jacuno- 
sus, strato corticali cartilagineo obductus. Apothecium: excipulum 
sübpedicellatum, thalamium eum thallo subcencoler, vel carneo-pal- 
lidam. — Lichen fraxineus Linn. " 
IH. Cetrarincei. Thallus frondosus vel subfistulosus, adscen- 
dens vel ereetus, plerumque reticulato-lacunosus. Apothecium: ex- 
eipulum peenliare nullum; tbalamium peltatum, thalli lobulis oblique 
adnatum. — Lich. islandieus Linn. 
5. Ceiraria A ch. 
IV. petkidei. Tiallus frondosus, prostratus, subtus tomen- 
tosus, vel venosus, laxe et interrupte adnatus. Apothecium: exci- 
Pulum peculiare nullum; thalamium peltatum, thalli lobis horizontali- 
ter vel verticaliter adnatum. 
6. Nephroma Ach. Thallus subtus avenius, subtomentosus. 
Apothecium: thalamium extremis et productis thalli lobulis antice ad- 
Nafum, conslanter nadum. — Lich. resupinatus Linn. 
7. Pelligera Hotfm. Thallus subtus venosus vel spongiosus. 
Apothecium:: thalamium extremis et produectis thalli lobulis antice ad- 
natum, primitus membrana thallodea, tenuissima, mox dehiscente 
velatum. — Lich. caninus Linn. 
S. Solorina Ach. Thallus subtus venosus vel fibrillosus. 
Apotheeium: thalaminm mediis thalli lobulis antice adnatum, primi- 
{us membrana thallodea, tenuissima, mox dehiscente velatum. — 
Lich. saceatus Linn. 
V. Umbilicarii. Thullus frondosus, prostratus, subtus fi- 
