148 Actii Societatis pro Fiuina ct Flora feuiiica. Vll. 



Thallus radiatim cosUUo-rugulosus. 

 Ad Iblia perennia arborum propc Rio dc Janeiro, n. 170 d. 

 Thallus opacus, maculas saepe rolundatas ibrinans. Gonidia 

 phycopcltidca, cellulis oblongo-cylindricis aut cylindricis, 0,oo8 

 0,0 4 millim. crassis, sat leptodermaticis, ad septas haud aut le- 

 vissime constrictis, in series radiantcs concatenatis et in mcm- 

 branam simplicem connatis. Ajjothecia thallo innata, demum 

 plus minusvc elevata, disco 0,3 0,2 5 [ 0,4] millim. lato, plano. 

 Ferithecium fusco-fuligineum, circ. 0,oio milHm. crassum, conni- 

 venti-obhquum, ex hyphis suberectis conglutinatis incrcbrc scpta- 

 tis formatum, strato thallino gonidia continente, basi sensim in 

 thallum abeunte obductum. Hymeniiim circ. 0,0 7o millim. cras- 

 sum, jodo fulvescenti-vinose rubcns. Epithecmm- sordidc palli- 

 dum aut dilute fuscescens. Paraphyses ramoso-connexae, su- 

 perne flexuosae, apice haud aut vix incrassatae. Asci clavati, 

 circ. 0,012 millim. crassi, membrana tota leviter incrassata. Spo- 

 rae 8:nae, apicibus obtusis, halone nuUo indutae, medio sacpe 

 levissime constrictae, celluhs subcyhndricis, fere aeque longis, 

 cellula secunda (ex apice superiore) saepe reliquis paullo crassiore. 



6. Arthonia. 



Ach. in Schrad. Journ. 1 B., 3 St. (1806) p. 3 pr. p., Lich. Univ. (1810) 

 p. 25; Dufour, Rev. Gen. Opegr. (1818) p. 5; TuL, Mem. Lich. II (1852) 

 p. 192; Leight., Mon. Brit. Graph. (1854) p. 51; Nyl., Syn. Arth. (1856) p. 88; 

 Th. Fr., Gen. Heterolich. (1861) p. 96 (emend.); Kickx, Mon. Graph. Belg. 

 (1865) p. 22; Linds., Mem. Sperm. Crust. Lich. (1870) p. 279, tab. XIY fig. 

 19, 1117; Tuck., Gen. Lich. (1872) p. 217; Frank, Biol. Krustenflecht. 

 1876 (Bot. Jahresber. 1876 p. 70); Leight., Lich. Great Brit. 3 ed. (1879) p. 

 414; Almqu., Mon. Arth. Scand. (1880) p. 8; Mull. Arg., Graph. Feean. (1887) 

 p. 4 et 53 (em.); Moller, Cult. Flecht. (1887) p. 37; Nyl. in Hue Addend. 

 (1888) p. 253. (Rehm in Rabenh. Krypt.-Fl. III 1890 p. 280.) 



Thalhis crustaceus, uniformis, epiphloeodes aut rarius hy- 



pophloeodes, hypothallo aut hyphis medullaribus substrato affixus, 



rhizinis et strato corticah destitutus. Stratum medullare stuppeum, 



hyphis tenuibus, leptodermaticis, lumine cellularum comparate sat 



lato. Oonidia ad species diversas minores majoresve Trente- 



pohliae (Ghroolepi) pertinentia, cellulis anguloso-globosis aut 



elhpsoideis, primum concatenatis, filamenta saepe parce ramosa 



formantibus, demum saepe pro parte etiam liberis, aut rarius 



