6 LICHENS. 



Genus V. — LETHARIA Zahlbr. 

 G. Letharia wandelensis Hue ; sp. nov. 



Thallusvirescentiochroleucus, fruticulosus,c basi valida et fere lignea 

 csespitosuscsespitemque 3 cent, latumformans, rigidus, solidus etopacus; 

 caules 3-4 cent, longi, non multum post basin decumbentes, teretes aut 

 subcompressi, diametro 0,5-1 [a metientes,simplices seu semel bisve fur- 

 cati ; in basi atrati et dein rufescentes ; in apice carbonacei ; in super- 

 ficie basin versus Ifeves, sed cortice facile et varie rupto, superiusbreviter 

 papillosi papillis albidis ac apicem versus sorediati sorediis rotundis, 

 vix prominulis et pulverulentis, raro albidis, plerum([ue cœsiis. Cortex 

 albidus, nudus et in zona angusta granulis flavidis hydrate kalico ruben- 

 tibus vel latericiis nubilatus, 80-100 \>- latus et in cauiibus summis aut in 

 ramis niinor (40-45(j. metiensj, in eo hyphœ decompositœ, axi pcrpendicu- 

 lares,Iuminel-l,5alato, indistinctseretequemaculismediocribus etinipa- 

 ribus efficientes. Gonidiaviridia, pleurococcoidea, 1 2-20 [z lata, membrana 

 pauluni incrassata, solitaria aut in parvis glomerulis disposita, sub cortice 

 vigentia atque cum hyphis gonidialibus 4-6 j-»- crassis et Iaxis stratum 

 60-100 ^. latum prsebentia. In axi hyphœ verticales, 5-6 ;/. crassee, lumine 

 1-1,5 [j. lato, arctissime agglutinatœ et nulia gonidia admittentes, passim 

 ramos8e,remotearliculat8e atque iodo leviter fugaciterque cœrulescentes. 

 Apothecia 0,5-0,6 ,«. lata, lateralia, adpressa, excipulo Isevi, margine 

 integro et non prominulo ac disco fusco et demum fusco atrato, nudo et 

 piano instructa. Excipuli cortex non summum marginem attingens, late- 

 raliter 40 et subtus 50-60 [j. latus, nudus et superne, sicut thalli cortex, 

 coloratus ; in eo hyphse paraphysibus perpendiculares, fastigiatee, indis- 

 tinctee, prope gonidia ramosse et in zona externa20 <j. lata, magis verti- 

 cales, parce ramosse, articulatse articulis aut sphœroideis aut oblongis, 

 lumine 2 ^. lato. Perithecium incoloratum et iodo non tinctum, in margine 

 140-150, lateraliter 40-50 et subtus 250 [a latum ; in eo infero, hyphœ arcte 

 coadunatœ, articulatse articulis sphœroideis vel oblongis, lumine 3-4^. lato; 

 in laterali, angustiores, lumine 1-1,5 [a lato, atque in margine flahellatse, 

 lumine paulo majore ac in latere,paraphyses paulumtegentes.Paraphyses 

 hyalinse, sursum fuscee et hydrate kalico rubescentes. 90-100 [i. altse 



