Lichcncs Exotici. III. 29 



110. Thalloidima (s. Toninia) aromatizans Mull. Arg.; thallus 



albus, primum granulans, granula circ. ^/^ mm lata, convcxa, dein in 

 squamas planas tenucs 1— 1 ^/g mm latas crenatas ' abcuntla, super- 

 ficie lacvia; apothecia -/a — 1 mm lata, sessilia, rufo-nigra, i)lana et 

 nigro - marginata , demum hemisphaerico - con vexa et immarginata, 

 nuda, sui)crne demum nitidula; cpithecium bene distinctum, rufo- 

 fuscum V. rufo-nigricans; hypothecium crassum, nigro-fuscum v.-rufum; 

 sporae 8-nae, 4-loculares, fusifomii-digitiformes, 22 — 25 /^ longae^ 

 6 — 6 '/a iU latae. — Ab affini Th, aromatico, s. Toninia aromatica 

 Mass. statim differt colore et tenuitate thalli, at dein cum proximo 

 Thalloid imate fusisporo s. Toninia fusispora Th. M. Fries 

 Scand. p. 334 fere confluit. Ab hoc rccedit apotheciis non omnino 

 nigris, lamina 5^nperne non livido-olivacea, cpithecio distincto intense 

 rufo-fusco et sporis validioribus. — Ad saxa in Washington Territory 

 America sept, confoed : Dr. Eckfeldt n. 357. 



111. Placodium flavo Stramineum Mull. Arg.; thallus intense 

 flavo-stramincus, diametro circ. polUcaris et minor, versus peripheriam 

 radioso-laciniosus, centro convexo-areolatus ibidemque hinc inde in 

 soredia nana orbicularia et tenuissime albo-granuloso-pulveracea 

 efllorescens; laciniae periphcricae circ. ^% mm latae, dichotome 

 ramosae, convexulac, contiguac et leviter imbricatae, arete adpressae, 

 superficic laeves. — Apothecia ignota. — Est species elcgantula, 

 quoad thalli formam fere cum PI. saxicola Korb. quadrans, sed 

 aliter colorata et laciniae minus convexae. — Ad saxa quartzosa in 

 Australiae provincia Victoria: Wilson n. 331. 



112 Lecania (s. Semilecania) molliuscula Mull Arg.; thallus 



albus, tenuis, subtartareo-farinosus , mollis, superficie minute subri- 

 moso-glcbosus; apothecia -/j ^/r, mm lata, sessilia, plana, mox con- 

 vexa, margine albo tenui prominulo integro et demum modice 

 imdulato cincta ; discus carneo - pallickis v. pallido - fuscidulus ; epi- 

 thecium albido-fulvescens v. albido-olivaceum; hypothecium cum 

 lamina hyalinum ; paraphyses conglutinatae ; asci angusti, 8 - spori ; 

 sporae 12 — 16 ^i longae et 3 — 4 ju latae, fusiformcs v. rarius altero 

 V. utroque apice obtusae, 2-loculares. — Habitu ad affinem pcru- 

 vicnsem L. xantholeucam Milll. Arg, L. Exot. n. 16 accedit, a 

 qua recedit thallo non diffracto, molli et ambitu angusto sporarum. 



— Corticola in Australiae prov. Victoria: Rev! Wilson n. 1372. 



1 13. Pertusaria i §• Leioplacae) arenacea Mull. Arg. ; thallus 



vestigiali - tenuissimus , subobsoletus , albus ; verrucae fructigerae 

 2 — 3 mm latae, albidae, hemisphaericae, apice rotundato- obtusae v. 

 modice depressae, ambitu sat regulares et laeves, basi baud dilatatae, 

 pallide pauci-ostiolatae; ostiola leviter depressa; asci lincares, 8-spori; 

 sporae 50 fi longae et 25 /.t latae v. etiam minores , ellipsoideae, 

 valde pachydermeae, intus laeves. — Affinis est brasiliensi Pertu- 



