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346 



682. Opegraphae sect. Solmoiheca Miill. Arg. Apothecia in 



thallo immersa, late aperta, perithecium propriuni in sectione 

 semilunato-completum, undique tenue v, basi pauUo crassius, 

 undique fuscuui. — Haec sectio nova eximie Opegraphae sectio- 

 nem Lecanactidem cum sect. Rotula conjungens, perithecio etiam 

 basi tenui a Lecanactidibus Auct. distinguitur et ad Stigmaiidii s. 

 Enterographae species accedit, at perithecio basi evoluto ab iis 



et a sect. Eotula sitnul differt. 



Hujus loci est: 



Opegrapha (s. Solmoiheca) polymorpha; Stigmatidium polymor- 

 phum Mull. Arg. L, B. n» 114. In regione africaua marocana. 



683. Opegraphae secL BoMa Mtill. Arg. ; Strtgulae spec. Montg. 

 Lich. Cub. (1838) et SjUog. p. 375; Plaiygraphae spec. Nj^l. 

 Enum, gen, p. 131, Leight. Lich. Amazon, p. 455, Stirton. Lich. 

 on Leaves p. Set 6. Thalli phyllogeni systema gonidiale phjl- 

 laotideum (ut in Opegrapha filicina^ vid. icon, pulchram in cl. 

 Bornetii oper. Gonid. t, 9, fig. 3); apothecia in thallo immersa, 

 late aperta, perithecium proprium lateraliter tantum evolutum, 

 fuscum, subtus deficiens, extus thallo adscendente et demum 

 lacinulatim v. lobulato-secedente spurie thallino-marginatnm, 

 Paraphyses intricatim connexae et structura sporarum cum re- 



liquis sectionibus conveniunt. 



* Sporae 4-loculares. 



684. Opegrapha (s. Rotula) melanophihalma Miill. Arg. Thal- 

 lus tenuis, virenSj laevis v. minute albido- v. pallido-granulosus, 

 demum dcsquamescens ; apothecia truncato-hemisphaerica, mar- 

 gine thallino spurio tumidula, intus crenato-angulosa; discus 



mm, latus, niger, orbicularis, sed margine spurio irre- 

 gulariter detegendo-refcracto angulosus apparens; epithecium 

 ftiscidulum , lamina hyalina , hypothecium tenue fuscidulum ; 

 sporae in aseis elongato-oboroideis octonae, hyalinae, 16—20// 

 longae, 5— 67j (Ji latae. — Similis Op, rotulae^ sed sporae evo- 

 lutae ambitu multo latiores (ut in Ope^ra/j^avana autcrassiores), 

 oblongato-ovoideae et tantum 4-loculares. — In foliis Trichiliae 

 guadripetalae prope Rio de Janeiro et in foliis coriaceis in Ma- 

 dagascaria. 



685. Opegrapha (s. Rotula) radians Miill. Arg.; Plaiygrapha 

 rotuia t centrifuga Leight. Lich, Amazon, n. 199. Thallus irre- 

 gulariter suborbicularis^ tenuis et exiguus v. demum confluenti- 

 majusculus, flavescenti-viridis aut -virens, radiatim costulis pro- 

 minentibus linearibus concoloribus percursus, caeterum non 

 granuligerus ; apothecia thallo obsolete adscendente marginata, 



circ. 



