DIE FT.ECHTEN DER JUAN FERNANDEZ- INSELN 325 



subnitidus vel fere opacus, KHO — , Ca Cl 2 2 — , laevigatas, continuus, in 

 ambitu linea tenui et nigricante cinctus, molliusculus, sorediis et isidiis desti- 

 tatus, homoeomericus; gonidia chroolepoidea, cellulis concatenatis, plus minus 

 rotundatis, 6 — 10 »j. latis, contentu dilute viridi-lutescente impletis. 



Apothecia sessilia, depressa, maculiformi substellata, ramis brevibus, ut- 

 plurimum confluentibus, I — 1,3 mm latis et paulum longioribus, obscure fusca, 

 epruinosa, emarginata, demum elabentia; hymenium angustum, superne rufo- 

 fuscum et KMO paulum in olivaceum vergcns, caeterum decolor et purum, I 

 cupreum; hypothecium decolor; paraphyses tenues, esc[>tatac, intricatae; asci 

 pyriformi subglobosae, ad basin abrupte cuneati, 28—30 ;j. longi et 18 — 20 [J. 

 lati, 8 spori; sporae in ascis 3—4 seriates, ex incolore mox fuscidulae et demum 

 fusco-obscuratae, solaeformes, rectae vel curvulae, triloculares, loculus apicalis 

 reliquis latior et major, membrana tenui cinctae, 11 — 15 (j. longae et 4 — 6 ;j, 

 latae. 



Pycnoconidia non visa. 



Masatierra: Quebrada Gutierrez, auf Juanza-Rinde (C. et I. SKOTTS- 

 berg). 



Die neue Art gehort zu jenen Arthonien, welche konstant dreizellige Spo- 

 ren besitzen. Die Sporen der bisher bekannten Arten dieses Formenkreises 

 sind durchwegs grosser. Benachbarte Arten diirften Arthonia ephclodes Nyl. 

 und Arthonia scitnla Krph. sein. 



*A. berberina A. Zahlbr. nov. spec. — Taf. 24, Fig. 2. 



Thallus epiphloeodes, tenuis, uniformis, flavido-albescens, nitidulus et laevi- 

 gatus, circa apothecia albidior, opacus et leviter verruculoso-inaequalis, KHO — , 

 Ca Cl 2 2 — , effusus, continuus, sorediis et isidiis destitutus, in margine passim 

 linea nigricante et tenui cinctus; gonidia chroolepoidea. 



Apothecia sessilia, immarginata, fusco-nigricantia, epruinosa, madefacte 

 plus minus in sanguineo-fuscum vergentia, irregulariter stellato-radiata, ramis 

 sat brevibus, angustis, ad apicem rotundatis vel retusatis, convexiusculis, usque 

 1 mm longis; hymenium superne rufo-fuscum, KHO nigricans, non inspersum, 

 caeterum decolor, purum, 70—80 [i altum, I e coeruleo cupreo-sordidescens; 

 hypothecium tenue, pallidum, flavescens, molle, ex hyphis intricatis formatum; 

 paraphyses tenuies, ramosae et intricatae, parum distinctae, eseptatae; asci 

 late pyri formes, ovali- vel subgloboso-clavati, ad apicem rotundati et membrana 

 crassa cincti, 40—48 [X longi et 16 — 18 [j. lati, 8 spori; sporae in ascis triseriales, 

 decolores, ellipsoideae vel oblongo-subcuneatae, utrinque rotundatae, rectae, 

 triseptatae, loculus apicalis reliquis multum major et paulum latior, septis te- 

 nuibus, ad septa non constrictae, 15 — 17 »j. longae et 5 — 6 [j. latae, I cupreae. 



Conceptacula pycnoconidiorum minuta, punctiformia, vertice nigro, vix 

 prominulo; perifulcrium dimidiatum, sub lente obscure fuscum; fulcra exo- 

 basidialia; pycnoconidia bacillaria, recta vel subrecta, 3,5 — 4 \i longa at ad 

 0,6 [J. lata. 



Masatierra: Portezuelo, beim SELRIRK-Denkmal, 590 m, auf Berberis- 

 Zweiglein (C. et I. Skottsberg). 



Die Art gehort in den Artenkreis der Arthonia varia (Ach.) Nyl. und 



