Zahlbruckner : New North American lichens 299 



* 



concolore, integro, primum haud prominulo, demum depresso ; 

 excipulo pseudoparenchymatico, cellulis leptodermaticis, angulosis, 

 gonidia continente ; epithecio anguloso, pulverulento, KHO pur- 

 pureo ; hypothecio decolore, sat lato, pseudoparenchymatico ; 

 hymenio decolore, in parte suprema aurantiaco-ochraceo, ioo- 

 no n alto, I violaceo-coeruleo ; paraphysibus filiformibus, crebris, 

 concretis, ad apices paulum latioribus et constricto-septatis ; ascis 

 hymenio subaequilongis vel parum brevioribus, ellipsoideis vel 

 oblongis, ad apices parum angustatis et rotundato-retusis, raem- 

 brana ibidem bene incrassata, 8-sporis ; sporis in ascis 2-3-seri- 

 alibus, decoloribus, polari-diblastis, isthmo tenuissimo, late vel 



Xanthoria ob anat 

 On basaltic rocks. 



9- 



m arizonicum 



losi 



Sect. Euleptogium. Thallus olivaceo-obscuratus, modice gela- 

 tinosus, imbricato-lobatus, lobis rotundatis vel inciso-rotundatis, as- 

 cendentibus, concavis, tenuibus, sorediis et isidiis destitutis, utrinque 

 corticatus, cortice e serie unica cellularum formato magnarum et 

 leptodermaticarum, parte centrali thalli gonidia nostocacea numerosa 

 et approximata continente. Apothecia superficialia, sessilia, basi 

 angustata, usque 1 mm. lata, primum bene concava, fere gyalect- 

 P'dea, demum subplana vel modice convexa ; disco obscurato, epru- 

 moso, nitidulo ; margine proprio tenui, integro, parum prominulo, 

 extusgrosse pseudoparenchymatico, cellulis in seriebus 3-4 angu- 



s, intus parum gelatinoso ; perithecio angusto, decolore, pseudo- 

 parenchymatico, cellulis minutis ; hypothecio decolore ex hyphis 

 mtncatis formato ; hymenio subdecolore, superne obscure cinna- 

 momeo-fusco, I intense coeruleo, demum obscurato ; paraphysibus 

 c onglutinatis, simplicibus, septatis, ad apices clavatis ; ascis oblongo- 

 c avatis, hymenio subaequilongis, 8-sporis ; sporis decoloribus, 

 «"psoidei s vel ovali-subfusiformibus, primum 3-septatis, demum 

 e Pauperato-muralibus, 18-27// longis et 7-12 fx latis. 



Species habitu collemaceo et sporis pauciseptatis distincta. 



On earth at the base of a northward-facing basaltic cliff. 



Heppia placodizans A. Zahlbr. sp. nov. 



*nallus in centro verruculoso-squamulosus, in margine effigu- 

 squ °' ,. lvaceo " vel umbrino-fuscus, opacus, KHO- CaCl 2 2 - 

 lati amu !* s cen tralibus plus minus congestis, parvis, 0.2-0.25 mm. 

 eloh • tUS fuscis > r <>tundis vel rotundatis, alte convexis vel semi- 

 ma i- hyphis medull anbus centralibus substrato affixis, lobis 

 rginahbus ad 2 mm. longis, angustis, subcylindricis, semel vel 

 lm breads, contiguis, omnino pseudoparenchymaticus, cel- 



ratus 



