228 Acta Societatis pro Fauna et Flora fennica, Vir. 



7. L. marginellum (Sw.) Mont., Lich. Cub. (183842) p. 



115 (mus. Paris.): Tuck., Syn. North Am. (1882) p. 162 (mus. Pa- 

 ris.), Miill. Arg., Lich. Beitr. (Pl. 1887) n. 1120. Lkhen marginel- 

 his Sw., Pr. n. Lid. Occ. (1788) p. 147 (secund. specim. orig. in 

 hb. Aeh.). Collema marginellnm Aeh., Lich. Univ. (1810) p. 650; 

 Sw., Lich. Am. (1811) p. 24, tab. XYIII. Leptogium tremelloid.es 

 var. marginelhim Nyl., Syn. Lich. (1858 60) p. 125 (mus. Paris.). 

 L. corrugatuhim N}^!., Syn. Lich. (1858 60) p. 132 (mus. Paris.), 

 Lich. Nov.-Gran. (1863) p. 429 pr. p. (excl. specim. sporis instructo : 

 mus. Paris.). 



Thallus tenuis, irregulariter lobatus, lobis circ. 15 1 millim. 

 latis, vulgo plus minusve confertis, ambitu vulgo rotundatis aut 

 undulato-crispatis, superne et inferne crebre rugulosus, rugulis 

 angustis, bene aut parum elevatis, acutis, demum interdam undu- 

 latis, praecipue longitudinaliter dispositis, tomento et isidiis desti- 

 tutus, plumbeo-cinerascens aut plumbeo-nigricans. Stralmn me- 

 dullare haud distincte mucosum. Apothecia margini thalli aut 

 rarius jugo rugulorum in superficie thalli crebre disposita, peltata, 

 circ. 0,3 0,7 milKm. lata (conf. infra) disco rufescente, margine 

 integro, pallido, demum vulgo lacinuhs vel isidiis thalKnis exaspe- 

 rato. Excijnilimi strato corticah e seriebus celhilarum phiribus 

 horizontahbus formato. Perithecium parenchymaticum, tenue. 

 [Sjwrae fusiformes, murales, long. 0,0 2 0,0 2 6 mihim. ( 0.0 3 

 milhm.: Tuck., 1. c), crass. 0,oo7 0,oio mihim.] 



x\d terram arenosam et in rupe prope Rio de Janeiro, n. 

 207, 379 (sine sporis). Thallus superne et inferne strato cor- 

 ticah parenchymatico e serie simiphce cehularum formato instru- 

 ctns, rhizinis destitutus. Gonidia nostocacea (?), tegumento mu- 

 cilaginoso nuho distincto, ceUuhs caeruleo-virescentibus, vulgo glo- 

 bosis, 0,0 3 0,0 4 mihim. crassis, monihformi-concatenatis, he- 

 terocystis hyahnis, globosis, 0,oo7 0,oo6 milhm. crassis, interca- 

 laribus. Apothecia disco plano aut concaviusculo, margine com- 

 parate crassiusculo, raro bene evoluto; in colL Wright. Lich. Gub. 

 n. 7 rite evoluta sporisque instructa sunt, at a Nyl. in Lich. Nov.- 

 Gran. p. 429 (ed. 2 p. 289) descripta ad hanc speciem non per- 

 tinent (stratum medullare in planta Lindigiana bene mucosum: 

 L. phyllocarpum, mus. Paris.). Excipulum strato meduhari te- 

 nui, parceque gonidia continente, haud mucoso. Hypothecium di- 

 lute palhdum. Hymenium circ. 0,i6o millim. crassum, jodo per- 



