66 ARKIV FÖR BOTANIK. BAND 13. N:0 13. 



Stizenberger Notiz über Parmelia perlata. Flora vol. LXXXI, 

 1888, p. 143. Wainio Étud. Lieh. Brésil I, p. 33. Acta Soc. 

 p. Fauna et Flora Fennica vol. VII, 1890. Hue Addenda nova 

 no. 280 bis, p. 332. In Revue de Botanique 1888. Ejusd. 

 Lichenes Exotici no. 614, Paris 1892, p. 74 (ubi syn.), Ejusd. 

 Lichenes Extra-Europaei. Nouv. Arch. Museum, sér. 4 a, vol. I, 

 1899, p. 206. WiLLEY Notes on some North American Species 

 of Parmelia. Botanical Gazette vol. XXI, 1896, p. 204. Zahl- 

 BRUCKNER Lichcnes in Ergebnisse der bot. Exp. . . . nach Süd- 

 brasilien 1901. Denkschriften der Math, naturw. Kl. der K. Akad. 

 d. Wissenschaften vol. LXXXIII, Wien 1909, p. (75) 161. 



Thalhis orbicularis, diam. usque 12 cm., vulgo sat rigidus 

 (rarius molliusculus), irregulariter lobatus, lobi minus distincte 

 radiantes, breves, 8 — 17 mm. lati, rotundati, integri vel sub- 

 integri, undulati, bullati, margines centrum versus adscen- 

 dentes, ad peripheriam laxe adpressi. Thallus ciliis, isidiis 

 et sorediis destitutus, subnitidus, crebre rugulosus, continuus 

 vel dein irregulariter ruptus. Color glaucescenti-albidus vel 

 albido-cinereus, subtus ad ambitum (5 — 8 mm.) castaneus, 

 nitidus, nudus, ceterum niger, rhizinis brevibus, concoloribus 

 vestitus vel pro parte nudus. 



Cortex superior loborum marginalium 14—16, dein 20 — 

 22 [J. altus, hyphae corticis adspersae, indistinctae, perpendi- 

 culares, pachydermaticae (6 — 8 [j. crassae), septatae, arete 

 contiguae. Medulla alba, 100 — 130 vel partibus vetustioribus 

 180 — 200 [J- alta, hyphae non vel parce adspersae, 3 — 4 [j. 

 crassae. Cortex inferior 13 — 14 (vetust, 18 — 20) ^. altus, niger 

 vel peripheriam versus fusconiger vel subdecolor. 



Apothecia numerosa, pedicellata, urceolata vel concava; 

 non perforata, rotunda vel mutua pressione varie angulosa 

 vel flexuosa, 12 — 13 mm. diam, Margo tenuis, integer, bene 

 inflexus. Receptaculum rugosum vel etiam scrobiculatum, 

 thallo concolor; cortex receptaouli irregularis, 40 — 50, rarius 

 usque 80 t^' altus, parte exteriore fusco- vel fumoso-cinereus, 

 ceterum decolor, ex hyphis perpendicularibus, pachydermaticis, 

 ± adspersis, arete contiguis, formatus, Gonidia sub toto 

 excipulo et infra corticem receptaculi in strato continuo in- 

 clusa. Excipulum 20 — 25 u. altum, decolor, hypothecium 

 20 — 25 p, altum, subdecolor, ex hyphis ± horizontalibus for- 

 matum. Discus badius, epruinosus. Hymenium 65 — 80 [J- 

 altum, parte superiore dilute flavofuscescens, ceterum de- 



