90 Acta Societatis pro Fauna et Flora fennica, VII. 



Trib. 18. Lecanactideae. 



Thallus crustaceus, vulgo homoeomericus. Stratum corti- 

 cate haud evolutum. Stratum medullare stuppeum, totum vulgo 

 goniclia eontinens, hyphis leptodermaticis. Gonidia ehroolepoidca. 

 Apothecia orbicularia, demum thallo adpressa. Excipulum carti- 

 lagineum, fuligineum, strato medullari stuppeo nullo, gonidiis de- 

 stitutum. Paraphyses ramoso-connexae. Sporae longae aut sat 

 longae, septatae, decolores, membrana interne haud incrassata. 



1. Lecanactis. 



Eschw., Syst. Lich. (1824) p. IS (emend.); Fr., Lich. Eur. Ref. (1831) 

 p. 374 (em.), Leight., Brit. Graph. (1854) p. 47 (em.); Mass., Ric. Lich. Crost. 

 (1852) p. 53 (em.); Koerb., Syst. Germ. (1855) p. 275 (em.); Th. Fr., Gen. 

 Heterolich. (1861) p. 93 (em.); Tuck., Gen. Lich. (1872) p. 193, Syn. North 

 Am. II (1888; p. 114. Opcgrapha sect. Ill Lecanactis Mull. Arg., Lich. Beitr. 

 (Fl. 1880) n. 156, Graph. Feean. (1887) p. 18. 



Thallus crustaceus, uniformis, hypothallo et hyphis medul- 

 laribus substrato affixus, rhizinis et strato corticali destitutus, 

 vulgo fere totus gonidia eontinens, hyphis tenuibus, leptoderma- 

 ticis. Gonidia chroolepoidea (Trent epohliae umbrinae Bornet 

 sirnilia). Apothecia demum elevata adpressaque, (saltern primum 

 orbicularia, lecideina gonicliisque clestituta, disco clilatato. Exci- 

 pulum proprium (e perithecio et hypothecio constans), fuligineum, 

 ex hyphis conglutinatis formatum, strato medullari nullo distincto. 

 Paraphyses ramoso-connexae ramosaeque, vulgo superne ilexuo- 

 sae. Sporae 8:nae aut pauciores, fusiformes aut fusiformi-oblon- 

 gae aut articulares, demum 3— pluri-septatae, decolores, loculis 

 cylindricis aut subcylindricis. „Pycnoconidia oblonga aut cylin- 

 lindrica. Sterigmata simplicia." (Tuck., Syn. North. Am. II p. 114.) 



1. L. Leprieurii (Mont.) Tuck., Gen. Lich. (1872) p. 194. 

 Lecidea Mont, in Ann. Sc. Nat. 3 ser. Bot. T. XVI (1851) p. 56, 

 Syllog. (1856) p. 34; Nyl., Lich. Nov.-Gran. (18(33) p. 463, ed. 2 

 (1863) p. 356 fmus. Paris.). Opegrapha Mull. Arg., Lich. Beitr. 

 (Fl. 1882) n. 439. Patellaria hicolor Karst. in Rev. Mvcol. 1889 : . 

 205. Lecanidion Saccardo, Syll. Fung. VIII (1889) p. 798. 



Thallus tenuis aut tenuissimus, cinereo- aut olivaceo-glau- 

 cescens. Apothecia vulgo sal solitaria, elevata, orbicularia aut 



