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Spiloma patadoxum Ach. Lichenogr. univ. 
•p. 139. ( Status evolutus.) t 
Lecidea dryina Ach. I. c. p.ijü. (Status im~ 
pcrfectior corticola.), 
Species pervulgata ad lignum et cortices Quer- 
cus, Abictis, Pini, Alni, Betulae etc, 
Specimioa in ligno denudato perfectiora; in 
cortice minora, obscuriora, magis scabrosa. Crusta 
tenuissima, late effusa, indeterminata, contiguaj 
junior membranacea, demura et pulverulenta, alba, 
cinerascens, tandem pallide ferruginea; passim ob- 
soleta, Apothecia convexa, mox planiuscula, iijre-* 
gularia, juniora fere rubra, dein fusca, tandem 
nigra, nuda nec pruinosa. Varietates non paucae, 
sed vix dignae, quae seorsim notenlur. Sporuli 
constanter fulvi et in speciminibus optime explicatis 
singulare hoc Yegetabile, liactenus male intellectum, 
optime distinguunt* 
J 7 , Pyrenothta. > ' 
Char. ess. Apothecia ostiolata, nucleum farina- 
ceum protrudentia, demum dilatata, subscutelli«* 
formia. 
Desc. Thallus crustaceus, effusus, adnatus, 
unifbrmis, constanter praesens, qui a fungis optime 
distinguit. Apothecia idiothalama , sessilia, regula- 
ria, juniora immarginata, subsphaerica raro cylin- 
drica. 1. depresso-subrotunda, undique plerumque 
pulvere albido obducla, conniventia (clausa); mox 
per ostioium aequale pulverulentum protrudentia 
nucleum, dein magis magisque dilatata, scutellifor- 
