DR. J. MUELLER ON NEW LICHENS. 455 
subepruinosa et cinereo-nigrescentia, haud crassa, plana; margo 
mediocris, prominens, e regulari demum undulato-irregularis ; 
discus planus, tarde undato-niger; hypothecium crassum, sub- 
nigrum, lateraliter in marginem non adscendens, unde margo in 
sectione omnino albo-thallinus; spore (in specim. costaricensi) 
Snx, 27-35 u longe et 3-4 » late, inferne longius angustate, 
vulgo arcuate, 4-loculares.—Hiec etiam spectat Lichen quem 
nuperrime in Bull. Soc. Bot. Belg. xxxii. p. 148 ad Pl. undu- 
latam, Muell. Arg. (Lecanora undulata, Fée), retuli et specimina 
illa hb. Féeani que acl. Nylander in Ann. Se. Nat. sér. IV. xi. 
ad Pl. epileucam, Nyl., relata fuerunt et que antea pro statu 
juniore Pl. undulate ipse habui, sed certe tamen ab ambabus 
differt. Thallus enim est minus firmus, leviter farinulentus, 
apothecia quam in Pl. undulata evidenter minora, multo minus 
crassa, margo tenuior et spore validiores. In Pl. epileuca spore 
7-septate indicantur. Pl. bimarginata Ny]. demum etiam valde 
similis sed nudior est et spore magis divise# sunt.—Corticola, in 
prov. Rio de Janeiro: Glaziou, n. 18043 (sine sporis), et in Costa 
Rica ad Boruca. 
12. PuaryeraPpHa FLEXUOSA, Muell. Arg.; thallus albus, 
tenuissimus, ambitu levis, ceterum demum rugulosus; lirelle 
graphidimorphe, primum innate, dein cum margine thallino 
cum thallo concolore tumidulo emergentes, ambitu varie, 4-2 mm. 
longe, } mm. late, novelle angustissime lineares, demum aut 
crebre anfractuoso-flexuose aut alternatim flexuoso-gibbose, 
apice nudo-nigrw, madefacte pallescentes; discus planus, rimi- 
formi-angustus; epithecium fuscum; hypothecium byalinum ; 
paraphyses connexw; asci anguste cylindrico-obovoidei, 8-spori 
spor» 27-36 p» longs, 5 p late, fusiformes, 6-8-loculares.—Juxta 
paraguayensem Pl. carneam, Muell. Arg., que longe tenerior et 
carneo-pallida, locanda est.—Ad lignum Palmarum: in ins. Bar- 
bados: Anderson. 
13. PLaTyGRAPHA MULTILOCULARIS, Muell. Arg.; thallus 
cinereo-albidus, maculiformi-tenuis et levis; apothecia j—} mm. 
lata, orbicularia et regularia v. anguloso-trigona v. etiam leviter 
oblongata, solitaria v. hinc 2-8natim in seriem confluentia, cras- 
siuscula marginata, emersa basique paullo constricta; margo 
thallo albior, integer; discus fusco-niger, madefactus fuscus, 
nudus ; epithecium fuscidulum ; hypothecium hyalinum ; para- 
physes connexe; asci angusti, 8-spori; spore 52-65 »p longe, 
