297 
lamium constanter denudatum, marginatum, concavum vel planum, 
ab exeipuli limbo subdiscretum (atrum vel rufescens). — Lich. seru- 
posus Linn. - 
15. Dirina Fr. Thallus uniformis. Apothecium: thalamium 
"earbonaceum , planum, strato thallodeo Ientiformi primum velatum, 
-dein denudatum. — Dirina Ceratoniue Ach. 
VIN. Lecitini. Thallus erustaceus. Apothecium: exeipu- 
lum proprium, constanter orbiculatum; thalamium concavum, planum 
vel tumescens, solidum. 
16. Gyalecta Ach. Thallus uniformis. Apothecium: exeipu- 
lum urceolatum, immarginatum. — Lich. eupularis Ehrh. 
17. Leeidea Ach. Thallus effiguratus vel uniformis. Apothe- 
cium: exeipulum planum, marginatum; thalamium planum, saepe in- 
tumescens exeipulique marginem obvallans, 
a. Psora Hall. Thuallus squamulosus, squamulis saepe in 
erustam varie plicatam confertis. — Lich. decipiens Ehrb. 
b. Rhizocarpon Ram. Thallus subieulum atrum, tenuissime 
fibrillosum,, areolis coloratis distinetum; areolis interdum in erustam 
Timoso-areolatam, nigro-limitatam eonfertis. — Lich. geographieus Linn. 
e. Catillaria Ach. Thallus uniformis, simplex,. — Lich. con- 
fluens Web. 
*Thalamio floccoso-pulverulento, vide Calicia sessilia. 
IX. Graphidei. Thallus erustaceus, uniformis. Apothecium: 
excipulum proprium, earbonaceum; primum orbiculatum, dein elonga- 
tum; thalamium ab inflexis exeipuli marginibus rimale. 
18. Oyegrapha Humb. — Lich. scriptus Linn. 
*Thalamium saepe absque exeipulo peculiari prorumpit, immar- 
ginatum, difforme vel radiato-stellatum. — Arthoniae geuus Ach. 
11. Cl. Lichenes capitati. > 
Apothecium: turbinatum vel sphaerieum, normaliter stipiti, quasi 
eapitalum insidens. , 
X. Calieioidei. Thullus erustaceus, plerumque in stipites 
intus solidos, simplieiusculos sucerescens. Apothecium: thalamium 
floecoso - pulverulentum; vel exeipulo proprio carbonaceo, turbinato, 
Marginato insillens, vel ipsi stipiti infixum. 
19. Calicium Pers. Apothecium: exeipulum carbonaceum, or- 
biculatum , planum vel turbinatum, marginatum, rarius sessile vel 
substipitatum , plerumque stipitatum; thalamium concavum, planum 
vel lentiforme. 
