KUNGL. SV. VET. AKADEMIBNS HANDLINGAR. BAND 57. NIO 6. 



35 



1891, p. 59. - Placodium rhodomma Hellb. in Bihang tili Kgl. Svensk. Vetensk.- 

 Akad. Handl., vol. XXI, afd. III, no. 13, 1896, p. 59. 



Thallus epilithicus, in margine subplacodinus, tenuis, O.i — 0.2 mm crassus, cae- 

 terum subsquamosus, squamis parvis, 0.3 — 0.4 mm latis, rotundatis, plus minus in- 

 cisis, planiusculis vel leviter convexis, demum soredioso-dissolutis, glancescenti-albidus, 

 opacus, KHO — , CaCLO., erythrinosus, in superficie subfarinaceus, hypothallo distincto 

 non limitatus; cephalodia e roseo subochracea vel ochracea, majorem partem thalli 

 occupantia, verruculoso-granulata, thallum haud superantia. 



Apothecia lecanorina, sessilia, ad basin bene constricta, usque 2 mm lata, dis- 

 persa, rotunda vel rotundata; discus e concavo subplanus, roseus, leviter pruinosus; 

 margo tliallinus thallo concolor, crassus, integer, subsphinctrinus, primum bene in- 

 flexus et prominulus, corticatus, gonidia copiosa continens; excipulum decolor, dimi- 

 diatum, ex hyphis longitudinalibus, tenuibus et conglutinatis formatum; hymenium 

 175—185 [>. altum, superne pulverulento-inspersum, KHO — , asci cylindrico-clavati, 

 8-spori ; sporae in ascis uniseriales, ellipsoideae vel ovales, membrana tenui et laevi 

 cinctae, 14—20 — (22) ;j. longae et 8 — 11 ;j. latae. Conceptacula pyenoconidiorum im- 

 mersa, vertice paulum impresso, nigricante; fulcra exobasidialia ; pycnoconidia capil- 

 laria, curvata vel hamata, 25 — 27 a longa et vix 1 ;x lata. 



Juan Fernandez: auf Lavatuff. 



Lecanora (sect. Placopsis) rhodocarpa Nyl. apud Hue in Nouv. Archiv, du 

 Museum, ser. 3., vol. III, 1891, p. 59. — Squamaria rhodocarpa Nyl. in Annal. 

 Scienc. Nat., Botan., ser. 4., vol. XV, 1861, p. 376. - - Placopsis rhodocarpa Nyl. in 

 Journ. Linn. Soc. London, Botan., vol. IX, 1868, p. 251 et Lieh. Nov. Zeland., 1888, 

 p. 56; Wainio in Hedwigia, vol. XXXVIII, 1899, p. (187). Placodium rhodocar- 

 pum Müll. Arg. in Bullet. Herbier Boissier, vol. II, appendix I, 1894, p. 46; 

 Hellb. in Bihang tili Kgl. Svensk. Vetensk.-Akad. Handl., vol. XXI, afd. III, no. 

 13, 1896, p. 59. 



Westpatagonien: Estero Peel, am grossen Gletcher, auf der Erde. 

 Lecanora (sect. Placopsis) gelida (Linn.) Ach. 



Juan Fernandez: Masatierra, Lavasteine in der Steppe auf der Südseite von 

 Portezuelo. 



Lecanora (sect. Placopsis) patagonica A. Zahlbr. nov. spec. 



Thallus crustaceus, substrato arete affixus, in margine effiguratus, orbicularis, 

 usque 8 cm latus (thalli plures utplurimum confluentes) tartareus, 0,15 — 0.2 mm altus, 

 ochraceo-glaucescens, opacus, KHO flavens, CaC] 2 0 2 erythrinosus, in centro areolato- 

 diffractus, areolis angulosis, fissuris demum altis separatis, superne planiusculis et 

 laevigatis, lobis marginalibus continuis, latiusculis, 2- — 3 mm latis, ad apicem obtu- 

 satis vel rotundatis, radiatim fissis, subplanis, ad ambitum tenuiter umbratis, sorediis 

 et isidiis destitutus, superne strato corticali, 25 — 30 ji crasso, ex hyphis tenuibus, 

 intricatis et dense pulverulento-inspersis formato obduetus; Stratum gonidialae infra 

 corticem situm, cellulis globosis, 6—8 [j. latis, viridibus, parum congestis, meclulla 



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