2H T. HEDLUND, KRITISCHE BEM. UBER LECANORA, LECIDEA U. MICAREA. 



Die Gattuiigen Lccanora, Lecidea und Micarea habe ich 

 in der naclifolgenden Begrenzuiig g-enommeii: 



Lecaiiora. 



Thallus crnstaceus; gonidia protococcoidea hyphis breviter 

 articulatis circnmdata, membranam non penetrantibus; apothe- 

 cia aperta, aut thallo iminersa excipulo subnnllo, aut elevata 

 excipnlo evoluto; pars centralis mediocris vel subnulla; pars 

 marginalis tota vel modo inferne strato medullari instrncta 

 gonidiis impleto stratoque corticali (interdum indistincto) 

 extns limitato, margine proprio nullo distincto vel ex hyphis 

 ]-adiantibns e parte centrali excipuli enatis contexto, partem 

 thallinam excipuli plus minus exeludente; paraphyses vulgo 

 parce ramosse vel simplices; sporte minores mediocresve (vix 

 ultra 40 [j- long.), incolorat?e, simplices aut 1 — S-septatae, 

 episporio hvvigato, niembrana et septis haud (ut in Itino- 

 (lina et Caloplaca) incrassatis, octona? aut raro pauciores 

 pluresve, giobosee — cylindrico-oblongae ; sterigmata et pycno- 

 conidia vari a. 



Sjii. Lecanora (Ach.) Wainio Étude I p. 73; Th. Fr. Scand. p. 211) 

 (excl. Ochrolechia et Fsoroma). 



Lecania (Mass.) Th. Fr. Scand. p. 289. 

 Gyalolechia (Mass.) Th. Fr. Scand. p. 187. 



Lecidea. 



Thallus crustaceus; gonidia protococcoidea vel pleurococ- 

 coidea, hyphis breviter articulatis circumdata, membranam 

 non penetrantibus; apothecia aperta; pars centralis excipuli 

 mediocris; pars marginalis ex hyphis radiantibus vel intricatis 

 contexta, gonidiis carens, vel subnulla; paraphyses simplices — 

 ramospe; sporffi ineoloratse, simplices vel uniserialiter (raro 

 paullum muraliter) septatse, septis haud (ut in Blastenia) 

 incrassatis, (vulgo) halone nullo circumdata^, octonfe aut raro 

 pauciores pluresve, globos»— aciculares; sterigmata et pycno- 

 conidia varia. 



Syn. Bilimbia, Biatorina, Catillaria, Biatora et Lecidea auct. p. p. 

 Bacidia (D. Ntrs.), Toninia (Mass.), Psora (Hall.) et Arthrospora 

 Mass.; Th. Fr. Scand. p. 330, 342, 411, 584. 



