LICHENS 17 



i. — L. Brialmontii Wain. (n. sp.). 



(Tab. II, fig. ii— 12.) 



Thallus fruticulosus , i3 — 6 mm. altus, crebre dichotomc fastigiato-ramosus , caespites crebros 

 formons, erectus aut partim prostratus, teres, partim verruculoso-incsqualis, truncis cire. o,6 — 0,4 mm. 

 crassis, apicibus obtusis, solidus, rhizinis destitutus, partibus gonidiiferis caesio-glaucescentibus, subdis- 

 persis, partibus decorticatis albido-pallescentibus, neque KHO, nec Ca.CU0. 2 , nec his reagentiis unitis, nec 

 jodo reagens, strato corticali destitutus, cartilagineus, ex hyphis irregulariter contextis, conglutinatis, 

 tenuibus, sat leptodermaticis formatus, heteromericus , medio gonidiis distitutus. Gonidia vnidia, pleuro- 

 coccacea, 1 — pluricellulosa, glomerulos in partibus extenoribus thalli formantia, diaiu. arc. 0,008 — 0,010 

 mm. Apothecia lateribus ramorum affixa, pcltata basique beuc constneta, scepe irregularia et lobata aut 

 flexuosa, 3 — 1 mm. lata, margine mediocri, ereuulato, thallo concolore, disco testaceo pallidove aut raro 

 fuseescente. opaco, planiusculo. Excipulum in parte inferiore hyphis acre leviter disjuuetis, ecterum carti- 

 lagineum, gonidia confinais. Hypothecium albidiun, jodo persistenter cœruleseais. Hymenium arc. 100 mm. 

 crassum, jodo persistenter cœruleseais. Paraphyses apice clavatœ, basin versus tenues, gelatinani in KHO 

 turgescentem percurrentes, basi ad hypothecium subhymeniale crebrius, ceterum parce ramoso-conexœ, in 

 parte superiore cellulis subellipsoideis aut oblongis. Epithecium pallidum aut tivido-pallescens aut totum 

 hymenium pallidum vcl livido-pallescens. Asci clavati. Sporœ 8:nce, distichœ aut tristichœ, décolores, 

 elongatcc aut oblongœ, apicibus rotundatis aut rarius obtusis, recta- aut raro leviter curvatœ, 3-scptafœ, 

 long. o,oi3 — 0,024, cross. 0,003—0,0045 inillim. Pvaioconidaugia thallo immersa, maculas fitscas, 

 cire. 0,2 mm. latas in lateribus ramorum formantia. Sterigmata longitudine cire. 0,014 — 0,016 mm., 

 ramosa, pauciarticulata, cellulis oblongis, 0,002 mm. crassis. Pycnocomdia filiformia , curvata, longitudine 

 cire. 0,016 — 0,020, crass. vix 0,001 mm. Habitu similis est Lecanorse (Cladodio) phryganiti Tuck. 

 (Syn. North Am. p. 182J, quod autan secund. specim. orig. in herb. Nyl. ramis multo crassioribus et 

 sporis simplicibus ab ea distinguitur. 



Détroit de Gerlache : dans les trous et excavations des roches très humides à l'Ilot Bob, 

 64 5o' de latitude sud (17 e débarquement, n. 262). 



2. — L. Gerlachei Wain. (n. sp.). 



(Tab. II, fi S . i3-i 4 .) 



Thallus primum adnatus et hypothallo albido fibrilloso-effuso substrato affïxus, lacimatus, laciniis 

 compressas, convexis, arc. 1 — o,3 mm. latis, demum adscendentibus, partibus adscendaitibus subfruticulosis 

 aut fruticulosis, leviter compressis aut subteretibus, creberrime breviter ramosis, demum crustam arc. 3—5 

 mm. crassam, e ramis confertis intricatisque constantem formons, albidus vel anereo-albicans, intus et 

 extus neque KHO, nec CaCL,0. 2 , nec his reagentiis unitis reagens, esorediatus, medulla alba. Gonidia pleuro- 

 coccoidea, flavo-virescentia, diam. 0,008 — 0,010 mm. Apothecia cire. 2 — 0,7 mm. lata, peltata basique 

 baie constricta, margine vulgo elevato, mediocri, crenato, thallo concolore, disco pallido aut Irado- 

 fuscesecute aut livido-nigricante, opaco, concaviusculo aut piano. Excipulum gonidia pleurococcoidea 

 abundanter continens. Hypothecium parte superiore cartilagincum, hyphis irregulariter contextis, in parte 

 inferiore hyphis acre leviter disjuuetis, albidum, jodo non reagens. Hymenium cire. 0,060—0,070 mm. 

 crassum, jodo persistenter cœruleseais. Epitheauni livido-fuscescens aut pallidum. Paraphyses taxe 



in 



R i3 



