2 Acta Societatis pro Fauna et Flora fennica, VII. 



muralesve (Atestia Trcv. et Argopsis Th. Fr.), membrana in- 

 terne haud incrassata. 



Sabtribus Parmeliearum hic omisimus, quia rantum tria earum genera, 

 omnia ad diversos subtribus pertinentia, in territorio nostro nobis obvenerunt. 



1. Usnea. 



Dill., Hist. Musc. (1741) p. 56 (pr. p.); Pers. in Ust. Xeue Annal. 1 St. 

 (1794) p. 21; Acli., Lich. Univ. (1810) p. 127 et 618 (pr. p., cxcl. Neurop. rae- 

 laxantho); De Not., Framm. Lich. (1846) p. 26; TuL, Mem. Lich. (1852) p. 27; 

 Mass., Mem. Lich. (1853) p. 72 (pr. p.j; Speerschneid. in Bot. Zeit. 1854 p. 193, 

 209, 233, tab. 7; Koerb., Syst. Germ. (1855) p. 2; Linds., Mem. Sperm. (1859) 

 p. 121, tab. IV fig. 18; Schwend., Unters. Flecht. (1B60) p. 110, tab. I, II; 

 Th. Fr., Gen. Heterolich. (1861) p. 47 (pr. p.); Nyl., Syn. Lich. (185860) p. 

 266, tab. VIII fig. 711; Miill. Arg., Princ. Classif. (1862) p. 25; Th. Fr., Lich. 

 Scand. (1871) p. 13; Tuck., Gen. Lich. (1872) p. 12 (pr. p.); Stirt., On Gen. 

 Usn. (Scott. Nat. 1881) p. 2 (emend.); Tuck., Syn. North. Am. (1882) p. 40. 



Tkalliis fruticulosus aut clemum fruticuloso-fiKformis, teres 

 aut angulosus, ramosus, undique similaris, rhizinis veris nullis, 

 basi (saepe incrassata) substrato affixus. Straium corticale thaili 

 chondroideum, ex hyphis formatum demum irregulariter contextis 

 aut partim subverticalibus, ramosis, conglutinatis, in ceUulas sub- 

 oblongas elongatasve divisis, membrana incrassata et lumine cel- 

 lularum angustissimo aut rarius bene distincto instructis, interdum 

 demum subamorphum. Straium meduUare tlialh parte exteriore 

 mijeloliypJiicum vel stuppeum et ex hyphis irreguiariter contextis, 

 membrana incrassata et lumine cellularum tenui instructis con- 

 stans, in parte interiore axem chondroideim centralem, ex hyphis 

 formatum longitudinaKbiis congiutinatis, membrana incrassata et 

 tubulo tenui instructis, continens. Gonidia protococcoidea (Bor- 

 net, Rech. Gon. Lich. 1873 p. 25), globosa, membrana sat tenui. 

 Apothecia lateraha aut demum liabitu subterminalia (apice rami 

 fertihs usque ad apothecium evanescente et demum solum appen- 

 dicem, lateri inferiori excipuh affixam, formante), peltata, tenuia, 

 subpallida aut substraminea. Excixmlum lecanorinum, margine te- 

 nui, vulgo radiato-ramoso, extus strato corticali chondroideo, cortici 

 thalh simih, obductum. Hypothecluin tenue, chondroideum, ex 

 hyphis crebre contextis conglutinatis formatum, strato medullari 

 impositum stuppeo, gonidia praecipue in parte inferiore infra stra- 

 tum corticale excipuh et parcius infra hypothecium et interdum 



