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formi aut aperto, perithecium integrum; sporae decolores. 
I. Selerographa. Apothecia elongata oblongave, disco rimae- 
formi aut aperto; peritheeium integrum; sporae obscuratae. 
Chiodeeton: I. Enterographa (Fee) Müll. Arg. 
lH. Stigmatidiopsis. Thallus crebre contextus, hypothallo 3 
crebre contexto aut indistineto; pseudostromata elevata aut 2 
evanescentia indistinctaque, in parte exteriore gonidia conti- 
nentia, hymenia vulgo plura aut rarius solitaria continentia; 
hypothecium obscuratum; sporae pluriseptatae, decolores; goni- 
dia chroolepoidea. III. Byssocarpon. Thallus laxius aut 
crebre contextus; pseudostromata elevata, exeipuliformia. extus 
hyphis laxe contextis instructa, gonidiis destituta, hymenia soli- 
taria aut subsolitaria continentia; hypothecium obseuratum; 
sporae pluriseptatae, decolores; gonidia chroolepoidea. 1. Pyeno- 
thallus. Thallus crebre contextus, hypothallo evanescente aut 
cerebre eontexto. 2. Byssophoropsis. Thallus sat laxe con- 
textus, hypothallo laxissime contexto, byssino. IV. Bysso- 
phorum. Thallus laxius contextus, hypothallo laxissime con- 
texto byssino vulgo saltem ad ambitum thalli conspicuo; pseudo- 
stromata saltem demum elevata, conspieua, in parte exteriore 
gonidia continentia, hymenia vulgo plura, rarius solitaria conti- 
nentia; hypothecium obscuratum; sporae pluriseptatae, decolores; 
gonidia chroolepoidea. V. Mazosia (Mass.). 
Arthonia: I. Arthothelium (Mass.). Il. Euarthonia 
(Th. Fr). 1. Naeviella. Apothecia nigricahtia, epruinosa, 
materias KHO intensius reagentes haud continentia (Sect. 
Naevia Almqu. A. punctiformis Ach. entbehrt der Gonidien, 
ist Gattung der Pilze). 2. Pachnolepia (Mass.) Almqu. 
3. Ochrocarpon Apothecia laetius colorata vel pallescentia 
(haud persistenter nigra), materias KHO intensius reagentes 
haud continentia. 4. Coniocarpon (DC.). III. AllarthoniaNyl. 
Pseudopyrenula: I Trypethelium (Spreng.). 1.Eutry- 
pethelium Müll. Arg. 2. Bathelium (Ach.) Müll. Arg. 
a. Chrysothelium. Pseudostromata extus obscurata, intus 
fulvescentia et materiam KHO violaseentem continentia. b. Chry- 
sothallus. Pseudostromata (et majore minoreve parte etiam 
thallus) solum extus ferruginea vel ochracea fulvescentiave et 
KHO violascentia. ce. Rhyparothelium Neque thallus nec 
pseudostromata materiam ochraceam KHO violascentem conti- 
nentia; apothecia in pseudostroma e thallo et cellulis substrati 
formatum immersa d. Melanothelium. Neque thallus nee 
pseudostromata materiam ochraceam KHO violascentem conti- 
nentia; pseudostromata e peritheciis elevatis confluentibus for- 
mata. II. Heterothelium. Apothecia simplieia. 1. Homalo- 
 theeium Müll. Arg. 2. Leptopyrenium. Peritheeium in- 
ES Ns: RR 
