79 



crenulatus, sporae 7—11 ^ longae, 4Va— 7 mm. latae. — 

 Multo minor est quam P, tiliacea v. rugosula Leight, et 

 laciniae baud discretae nee subtus longius atro-rhizinosae, 

 unde etiaiu Sibf^nstro-amerk^uB.P.siiMaevigala'NytrecediL 

 P. texana Tuck, demiim thallo soredioso et P. livida TayL 

 apotheciis glauco-pruinosis raodice distant. — Habitat trunci- 

 cola in Texas prope Dallas : J. Boll. 

 47, PolyUastia dispora Mul!. Avg., thallus endophloeodes, mox 

 epidermide soluta tenuissime cretnceo-subfarinosus, demum 



evanescens; perithecia V4 — Vs ^^^i. lata, nonnihil depresso- 

 .sphaerica, primum emergentia et thallo albo-velata, superne 

 mox denudata et nitidula, demum tantum dimidia parte v. 

 triente inferiore immersa, inaequaliter Integra,- i. e. quoad 

 partem irrimersam tenuiora el nigro-fusca, caeterum nigra, 

 apice minutissime v. non papillata, intus pallida; asci di- 

 spori, obovoideo-cylindrici, circ, 55fAloDgi, basi stipitiformi- 

 angustati ;■ sporae hyalinae, 13 — 23 p longae, 7— 9 ft latae, 

 oblongo-ellipsoideae v. juniores ambitu latiores, mox e lo- 

 culis-4plus miuusve cruciatim divis 16-Ioculares, sc. loculi 

 6— 8 longitrorsura semel divisi; paraphyses laxe cancellato- 

 ramosae, flaccidae, circ. l*|jmm. crassae, nonnihil cumascis 

 conglutinatae. — A P. Zadea Mass. praesertira jjscis 2-sporis 

 ' et sporis minoribus et dein peritheciis raagis emergentibus 

 magisque demum denudatis differt. luxta FolyUastiam 

 gemellam (Verrucariam gemellam Nyl. in praesente Flora 

 1858 p. 381 et Pyrenoc. p, 40) inserenda est, eujus asci 

 etiam dispori, sed perithecia (fide specim. detectoris) minus 

 ■ alte emergentia magisque pulveraceo-velata et. sporae dnplo 

 et ultra majores. — Crescit corticola in.Texas prope Dallas, 

 ubi legit et amice mecum communicavit oculatissimus J. 

 Boil. 



Beliquiejusdeni collectionis sequuntur: 

 Usnea harhaia v. hirta Fr. — TJ. harhata v. strigosq Nyl. (copi- 

 ose). — U* angulata Acli. — Bamalina calicaris Fr. — E. Yemensis 

 L membranacea (Laur.) Nyl. — Ji, tenuis Tuck, (pulchre et copi- 

 ose). — Borrera exilis Ach. (copiose). — B* chry sophthalma Acb. 

 Parmelia perlata v. ciliata Schaer. — P^ perforata Ach, f. — P. hypO' 

 tropa Nyl. (pulchre et copiose) — Physcia comosa Nyl. c. fr. — P. 

 stellaris Fr. — * P. stellarisy.angusfatai^yl — P. dbscura Fr. 

 *P,dbsciira w.sciastrellal^yL — P. ohscura \. adglutinata Fr. 

 * P. pulverulenta v. angusiata Nyl. — * Xanthoria (Thelochistes) 



