DIE FLECHTEN DER OSTERINSEL 



459 



BiicUia (sect. Eiibutllia) barrilcnsis A. Zahlbr. nov. spec. 



Thallus crustaceus, uniforniis, expansus, tenuis, tartareiis, pallide isabellinus 

 vel straminescens, opacus, KHO parum magis flavens; Ca CljOj — , KHO 4- 

 CaCl2 02 — , verruculosus, verruculis confertis, rotiindatis vel subirregularibiis, 

 laevigatis, sorediis et isidiis non praeditus, in margine linea nigra angustaque 

 cinctus; medulla alba, hyphis non amyloideis. 



Apothecia sat crebra, dispersa vel approximata, nigra, opaca, parva, 0,4 — 

 O7 mm lata, rotunda, mox convexa, margine depresso; discus non pruinosus; 

 excipulum fusconigrum, dimidiatum, tantum ad latera hymenii evolutum; hypo- 

 thecium fuscescens, molle, ex hyphis intricatis formatum; hymenium superne 

 sat latiuscule et sat bene determinate nigricans, granuloso-pulverulentum, caeterum 

 decolor et purum, ad 80 a altum, 1 violaceo-coeruleum, demum sordide obscu- 

 ratum; paraphyses capillari-filiformes, simplices, eseptatae, ad apicem capitato- 

 clavatae, conglutinatae; asci ellipsoideo clavati, superne rotundati et membrana 

 incrassata cincti, recti, hymenio subaequilongi; sporae in ascis bi- vel triseriales, 

 fuscidulae, ellipsoideae vel ovali-ellipsoideae, utrinque bene rotundatae, rectae, 

 uniseptatae, septo et membrana tenui, ad septum non constrictae, 14 — 17 a 

 longae et 6-%^^. late. 



Pycnoconidia non visa. 



Masafuera: Cordon de Barril, 1,000—1,300 m, auf vulkanischem Gestein. 



In der Artenreihe mit gelbem Lager kommt die als neu angesprochene 

 Art der Buellia Glazioua7ia zunachst und lasst sich von dieser durch das 

 warzige kornige Lager leicht unterscheiden; von Buellia concinna var. oceaiiica 

 trennt sie die fehlende Chlorkalkreaktion des Thallus und das helle Hypo- 

 thezium. 



Buellia (sect. Eiibuellia) halophiloides A. Zahlbr. nov. spec. 



Thallus epilithicus, tenuis, substrate arete adpressus, rosulas rotundatus, 

 vel irregulares, ad 1,5 cm lates, confluentes formans, tenuis, tartareus, isabellino 

 albidus, opacus, KHO — vel dilute flavescens, Ca CI2O2 — , KHO -r Ca CI2O2 — , 

 tenuissime rimoso-areolatus, areolis parvis, usque 0,5 mm latis, demum leviter 

 convexis, in margine protothallo distincta non circumdatus; medulla alba, ex 

 hyphis non amylaceis formata. 



Apothecia crebra, dispersa vel approximata, lecideina, primum adpressa, 

 demum sessilia, nigra, opaca (detrita nitidula), primum plana et margine proprio 

 angusto, vix perspicuo cincta, demum convexa, margine depresso, usque 0,8 

 mm lata; excipulum dimidiatum, fuligineum; hypothecium olivaceo-fuscum, molle; 

 hymenium superne anguste nigrescens, non inspersum, caeterum decolor et 

 purum, 60 — 65 a altum, I violaceo-coeruleum; paraphyses filiformes, eseptatae. 

 ad apicem clavato-capitatae, conglutinatae; asci ellipsoideo- vel subovali-clavati, 

 superne rotundati et membrana incrassata cincti, 8-spori; sporae in ascis 

 biseriales, fuscae, ellipsoideae vel subovales, rectae, utrinque sat late rotundatae, 

 uniseptatae, septo tenui, ad septa non vel nonnihil levissime constrictae, mem- 

 brana tenui cinctae, 9 — ii a longae et 4 — 5 a latae. 



Pvcnoconidia non visa. 



