Lecidea. 35 



Biatorina (Psorotheciitm) Mass., Misc. Lichenol. (1S56) p. 40. Psoro- 

 theciam Mass., Esam. Comp. Gen. (1860) p. 16. Patellaria sect. Psorothecium 

 Mull. Arg., Lich. Beitr. (Fl. 1882) n. 433, cet. Heterothecium ** Psorothecium 

 Tack., Syn. North Am. II (1888) p. 54. 



34. L. sulphurata (Mey. & Flot.) Wainio. Megalospora sul- 

 phurate* Mey. et Flot. in Act. Ac. Nat. Cur. (1843) XIX Suppl. I 

 p. 228. Patellaria Mull. Arg., Rev. Lich. Mey. p. 316, Lich. Beitr. 

 (Fl. 1885) n. 956, (1886) n. 1027, 1028, (1888) n. 1405. 



Thallus crustaceus, sat crassus aut mediocris, sublaevigatus 

 aut leviter verrueoso-inaequalis, subcontinuus aut irregulariter 

 diffractus, stramineus aut stramineo-glaucescens, medulla strami- 

 neo-albicante sulphureave, KHO lutescente. Apothecia adpressa, 

 circ. 5 — 2 ( — 1,5) millim. lata, disco piano aut demum vulgo con- 

 vexo, atro aut fusco, nudo, margine crasso, fusco aut atro, per- 

 sistente aut subpersistente aut rarius demum excluso. Hypothe- 

 ciiim albidum, tenue, zonae tenui vulgo fulvorufescenti vel dilute 

 rufescenti excipuli impositum. Sporae binae aut solitariae — 6:nae, 

 reniformes, apicibus rotundatis, curvatae, 1-septatae, long. 0,0 6 

 — 0,0 32, crass. 0,0 3 — 0,oi7 millim. 



Ad corticem arborum suis locis, velut ad Sitio in civ. Mina- 

 rum, frequenter obvenit, n. 536, 572, 810, 821, 847, 1007. — 

 Thallus esorediatus, KHO solum intus lutescens, Ga Gl 2 2 non 

 reagens, KHO (Ca Gl 2 2 ) superne et intus lutescens, partim hypo- 

 thallo nigricante limitatus. Excipidum proprium, gonidiis desti- 

 tutum, parte exteriore fere chondroidea, ex hyphis radiantibus 

 conglutinatis formata, membranis sat tenuibus et cellulis brevibus 

 longioribusve, in parte interiore hyphis irregulariter contextis, par- 

 tim conglutinatis, partim parce aere disjunctis, extus rufescens, 

 KHO violascens, partim strato tenuissimo amorpho decolore ob- 

 ductum, intus sordide fulvescens aut sordide pallidum, infra hy- 

 pothecium vulgo zona tenui fulvorufescente rufescenteve. Hyme- 

 nium circ. 0,2 oo millim. crassum, oleosum, semipellucidum, jodo 

 persistenter caerulescens. Epithecium fuscum aut rufo-fuscescens, 

 KHO non reagens. Paraphyses apice arete, ceterum laxe cohae- 

 rentes, 0,ooi5 millim. crassae, apice haud aut levissime incrassa- 

 tae, haud constrictae, haud ramosae aut parce furcatae. Asci 

 clavati aut subcylindrici. Sporae decolores, intus membrana bene 

 incrassata et concentrice striata, exosporio modice incrassato et 



