426 A. Zahlbruckner, 



Cetraria meJanothrix Montg., S3^11oge cryptog. (1856), 

 p. 324. 



Ad »Fazenda ingles« prope Petropolin, corticola (Höhnel, 

 Nr. 27, fmctifera). 



Parmelia petropoliensis A. Zahlbr. nov. spec. Tab. I, 

 Fig. 1. 



Thallus superne in centro osseo-glaucescens, caeterum 

 pallide ochraceo-rufescens vel (imprimis versus ambitum) 

 rufescenti-fuscus, nitidus, intus albus vel in partibus fusces- 

 centibus thalli dilute ochraceo-luteus, inferne partim rufescenti- 

 ochraceus vel rufescens, partim expallens, nitidus, laciniis 

 4 — 6 cm longis, inaequaliter dilatatis, irregulariter vel sub- 

 pinnatim lobatis, lobis vei'sus basin angustioribus, rotundato- 

 incisis, laciniis lateralibus in margine integris vel crenulatis, 

 laciniis terminalibus digitatim divisis, adscendentibus, lobulis 

 rotundato-oblongis vel oblongis, e sinubus angustis et rotundis 

 adsurgentibus, apice sorediosis (soralibus subscutelliformibus), 

 laciniis omnibus in margine crebre ciliatis, ciliis 2*5 — Amm 

 longis, patentibus flexuosisque, nigris, simplicibus vel in parte 

 superiore furcatis; isidiis destitutus, membranaceus, subtus 

 versus centrum rhizinis minutis nigris, sat crebris munitus, 

 versus ambitum late nudus vel partim rhizinis minutis nigris- 

 que ciliis intermixtis vestitus et leviter scrobiculato-inaequalis, 

 superne- laevis, irregulariter vel hinc inde fere areolato-rimulo- 

 sus; KHO superne flavescens, demum aurantiaco-lutescens, 

 intus subferrugineus vel in partibus coloratis thalli ferrugineus, 

 CaClaOg — ; cortice superiore hyalino, subamorpho, 20 — 27 [jl 

 crasso, ex hyphis irregulariter ramosis formato, cortice inferiore 

 pallido vel dilute fuscescente, 17 — 19 [x crasso; hyphis medul- 

 laribus 3 — 3*6 \x crassis, pachydermaticis; gonidiis proto- 

 coccoideis, 5 — 8 \x latis. 



Apothecia et pycnoconidia non visa. 



Ad »Fazenda ingles« prope Petropolin, in sylvis corticola 

 (Höhnel, Nr. 177). 



Die vorliegende Parmelia ist innerhalb der Section 

 Amphigymnia Wainio neben Parmelia melanothrix (Mont.) 



