2 Acta Societatis pro Fauna et Flora fennica, VII. 



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

 terne haud incrassata. 



Subtribus Parmeliearum hie omisimus, quia tantum tria earum genera, 

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



1. Usnea. 



Dill.. Hist. Muse. (1741) p. 56 (pr. p.); Pers. in Ust. Neue Annal. 1 St. 

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

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

 Mass., Mem. Lich. (1853) p. 72 (pr. p.); 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. 1—8; Schwend., Unters. Flecht. (I860) p. 110, tab. I, II; 

 Th. Fr., Gen. Heterolich. (1861) p. 47 (pr. p.); Nyl., Syn. Lich. (1858—60) p. 

 266, tab. VIII fig. 7—11; Mull. 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. 



Tkallus fruticulosus aut demum fruticuloso-filiibrmis, teres 

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

 basi (saepe incrassata) substrate- affixus. Stratum corticate thalli 

 chondroideum, ex hyphis formatum demum irregulariter contextis 

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

 oblongas elongatasve divisis, membrana incrassata et lumine cel- 

 lularum angustissimo aut rarius bene distincto instructis, interdum 

 demum subamorphum. Stratum medullare thalli parte exteriore 

 myelohyphicum vel stuppeum et ex hyphis irregulariter contextis, 

 membrana incrassata et lumine cellularum tenui instructis con- 

 stans, in parte interiore axem chondroideum centralem, ex hyphis 

 formatum longitudinalibus conglutinatis, membrana incrassata et 

 tubulo tenui instructis, continens. Gonidia protococcoidea (Bor- 

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

 Apothecia lateralia aut demum habitu subterminalia (apice rami 

 fertilis usque ad apothecium evanescente et demum solum appen- 

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

 subpallida aut substraminea. Excipulum lecanorinum, margine te- 

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

 thalli simili, obductum. Hypothecium tenue, chondroideum, ex 

 hyphis crebre contextis conglutinatis formatum, strato medullari 

 impositum stuppeo, gonidia praecipue in parte inferiore infra stra- 

 tum corticale excipuli et parcius infra hypothecium et interdum 



