( 407 ) 



albicante vel albiclo - cinerascenle ; 3) subocellata Ach. Syn. 

 1. c, Schajr. Emm. 1. c, L. H. 284, Nyl. L. P. 82, ad fraxinos, 

 castaneas et alias quasdam arbores , apotheciis albo-vel albido- 

 marginatis; 4) divisa Leight. Br. Graph, p. 21 et 22, ad corylos 

 et castaneas in Gallia passim , (in Anglia ad fraxinos et betulas) , 

 apotheciis substellatini furcato-divisis , thallo sa'pe fere evane- 

 scente, (hue etiam Op. rubida Chev. et crucianella Chev. et Op. 

 rufescens ySiV. siderella Schser. L. H. 9G pr. p.). — Spermatia 

 liujus speciei recta, longit. fere 0,005 millim. 



16. O. Diirisei Mont, in DR. Ahjer. p. 279, t. 18, f. 1. Thallus 



albus cretaceus vel albidus satis tenuis determinatus, rimulosus, 

 apothecia innata nigra albo-suffusa, singulum in areola thallina 

 undique rimose discissa insidens , linearia flexuoso-plicata, epi- 

 thecio rimiformi dcnudato, intus albida ; spora> fusiformes 3- 

 septatre, longit. 0,024-25 millim., crassit. 0,007-8 millim., 

 paraphyses bene regulares. Gelatina hymenea iodo vinose rubens. 

 — Ad Alger supra lapides calcareos. Apotheciis contortis mox 

 distat ab Op. endoleuca, et habitu potius Lecanoram calcaream 

 f. phlyctiformem monspeliensem quodammodo refert. 



17. O. stictiea Nyl. in Li ch. Alger, p. 315; Lecanactis sticlka DR. 



et Mont. Fl. Alger, p. 282, t. 18, f. 2. Thallus albus tenuis 

 satis determinatus, fere farinosus, continuus, apothecia super- 

 ficialia ronferta, opaca, parva, rotundata vel oblonga, epilhecio 

 piano vel concaviusculo, margine demum obsolete, intus hymenio 

 albido ; sporsc incolores fusiformes 7-septatai, longit. 0,019-26 

 millim., crassit. 0,003-5 millim., paraphyses non bene distincta?, 

 hypothecium infra crasse nigrum. Gelatina hymenea iodo vinose 

 rubens (interdum prsecedente versus hypothecium coerulescentia 

 evanida). — Ad truncum vetuslum suberis in Algeria, La Calle, 

 lecta a eel. Durieu. Vergit versus Platygraphas , sed forma apo- 

 theciorum est opegraphina. 



III. PLATYGRAPHA Nyl. Classif. 2, p. 188. 



Apothecia nigra vel nigricantia a thallo (plurimis parum) marginala , 

 planiuscula, simplicia vel paucis divisa; sporsc 8"« fusiformes. Sper- 

 matia curvatula aut recta. 



