Leptogium. 225 



siformes aut ellipsoideo-fusiformes, murales, long. O.ois — 0,0 3 2, 

 crass. 0,0 7 — 0,oo9 millim. 



Ad truncos arborum prope Sitio (1000 metr. s. m.) in civ. 

 Minarum, n. 668, et prope Rio de Janeiro, n. 2. — Thallus su- 

 perne et inferne strato corticali e serie simplice cellularum for- 

 mat o instructus, rhizinis destitutus. Stratum medullare gonidiis 

 nostocaceis et hyphisO.ooi — 0,0 3 millim. crassis, leptodermaticis. 

 Apotlwcia disco vulgo planiusculo. Excipulum strato corticali 

 grosse parenchymatico, toto e seriebus pluribus cellularum for- 

 mato, strato medullari gonidia continente, perithecio eva- 

 nescente neque distincte ab hypothecio differente. Hypothecium 

 pallidum, sat tenue, ex hyphis irregulariter contextis conglutinatis 

 formatum. ffymenium circ. 0,i2o millim. crassum, jodo persi- 

 stenter caerulescens. Epitheciam rufescens aut pallidum. Para- 

 physes arete cohaerentes, apice saepe leviter incrassatae. Asci 

 subcylindrici aut cylindrico-clavati. Sporae 8:nae aut 6:nae, mo- 

 nostichae aut distichae, apicibus acutis attenuatisque aut rarius 

 obtusis, murales, septis transversalibus 5—3, cellulis haud nu- 

 merosis. 



4. L. caesium (Acb.) Wainio. Cottema tremelloides ft. C. cae- 

 sium Ach., Lich. Univ. (1810) p. 656 (hb. Ach.). Lichen tremelloi- 

 des Huds., El. Angl. ed. 2 (1778) p. 537?, haud Linn, fil., Syst. 

 Veg. Suppl. (1781) p. 450 (conf. Wainio, Rev. Lich. Linn. p. 5). 

 Collema tremelloides b. cyanescens Ach., Syn. Lich. (1814) p. 326; Er., 

 Lich. Suec. Exs. (1818) n. 70 (mus. Paris.), Sched. Grit. (1825) p. 

 17. Parmelia cyanescens Schaer., Lich. Helv. Exs. (1842) n. 409 

 (mus. Paris., hb. D. C). Lept. tremelloides Nyl., Syn. Lich. (1858 

 —60) p. 124 pr. p. (mus. Paris.); Tuck., Syn. North Am. (1882) p. 

 161 pr. p. L. trem. f. isidiosa Mull. Arg., Lich. Beitr. (1882 ) p. 374. 



Thallus tenuis, irregulariter lobatus, lobis circ. 15 — 2 millim. 

 latis, vulgo plus minusve confertis, ambitu rotundatis integrisque, 

 superne inferneque sat laevigatus, haud tomentosus, superne isi- 

 diosus, plumbeus aut plumbeo- caerulescens vel cinereo-fuscescens. 

 Stratum medullare bene mucosum. Apothecia peltata, circ. 2—0,8 

 millim. lata, disco vulgo fusco- aut testaceo-rufescente, margine 

 integro, cinerascente aut cinereo-pallescente, subsimplice thallode- 

 que, margine proprio evanescente. Stratum corticate in margine 

 excipuli e serie simplice cellularum formatum, in parte basali se- 

 ries cellularum plures continens. Perithechnn grosse parenchy- 



15 



