2391 
11. Parmelia Ach. Apothecium scutellare, sessile, superfi- 
ciare; thalamium a thallo discoler, colore varium, Thallus subtus 
subfibrillosus. 
a. Lobaria Schreb. Thallus late laciniatus, laciniis rotun- 
dato-lobatis, subtus fibrillesis, laxe adnatus. 
b. Imbricaria Schreb. Thallus anguste laciniatus, laciniis si- 
nuato-lacinulatis, imbricatis, eentrifugis. 
e. Squamaria Hoffm. Thallus squamulosus, squamulis imbri- 
eato-lobatis. 
C. Thallus erustaceus. 
12. Lecanora Ach. Apothecium scutellare, sessile, superfi- 
eiare; thalamium constanter denudatum, immarginatum, planum. 
a. Psoroma Ach. Thallus squamulosus, squamulis centrali- 
bus in crustam areolatam confertis. 
b. Placodium Hill. Thallus ad ambitum stellato-radiatus, 
centro rimoso-areolatus. 
c. Rinodina Ach. Thallus uniformis. 
13. Urceolaria Ach. Apothecium scutellare, sessile, super- 
ficiare ; thalamium eonstanter denudatum, marginatum, concavum vel 
planum, ab exeipuli limbo subdiseretum, atrum vel rufescens. 
14. Dirina Fr. Apothecium scutellare, sessile, superficiare; 
thalamium strato thallodeo primum velatum, dein denudatum, pla- 
num, atrum. 
Ordo 3. Patelliferi. 
A. Puiella orbiculata; discus aequabilis. 
15. Gyalecta Ach. Apothecium patellare, urceolatum, inmar- 
ginatum. Thallus erustaceus, uniformis. 
16. Lecidea Ach. Apothecium patellare, planum, marginatum, 
margo a thalamio sensim infumescente saepe obvallatus. Thallus 
erusfaceus. 
a. Psora Hall. Thallus squamulosus, squamulis saepe in 
crustam varie plicatam confertis. 
b. Rhizocarpon Ram. Thallus: subiculum atrum, tenuissime 
fibrillosum , areolis coloratis distinetum; areolis interdum in crustam 
timoso-areolatam , nigro-Iimitatam conferlis. 
c. Catillaria Ach. Thallus uniformis, simplex. 
B. Patella elongata, disco rimali vel varie plicato dehiscens. 
17. Opegrapha Humb. Apothecium patellare, primum orbieu- 
latum , dein ovatum vel lineare; disco ab inflexis exeipuli marginibus 
19 * 
