Usnea. 13 



mineum aut subpallidum. ParapJiyses 0,ooi5 millim. crass., api- 

 cem versus parum incrassatae, haud ramosae, haud constrictae. 

 Asci clavati, 0,012 — 0,oio millim. crass., apice membrana modice 

 incrassata. Sporae distichae, breviter ellipsoideae aut subglobosae 

 aut ovoideae, apicibus rotundatis, long. 0,009— 0,oo6, crass. O.oot 

 — 0,oo4 millim. 



2. Ramalina. 



Ach., Lich. Univ. (1814) p. 122 et 593; Fr., Licli. Eur. (1381) p. 28; De 

 Not., Framm. Lich. (1846) p. 33; Tul., Mem. Lich. (1852) p. 26, 168, tab. 2 

 fig. 13—15; Mass., Mem. Lich. (1853) p. 63; Speerschneid. in Bot. Zeit. 1855 

 p. 345, 361, 377, tab. Ill; Koerb., Syst. Germ. (1855) p. 38; Linds., Mem. 

 Sperm. (1859) p. 126, tab. V fig. 6—18; Nyl., Syn. Lich. (1858—60) p. 287, 

 tab. 8 fig. 24—31; Schwend., Unters. Flecht. (1860) p. 155, tab. 5 fig. 7—11; 

 Th. Fr., Gen. Heterolich. (1861) p. 50; Nyl., Mon. Ram. (1870) p. 5; Th. Fr., 

 Lich. Scand. (1371) p. 33; Tuck., Gen. Lich. (1872) p. 5, Syn. North Am. 

 (1882) p. 20; Lindau, Anlag. Flechtenap. (188S) p. 17. 



TJiallus fruticulosus, basi substrate- aflixus, teres aut saepius 

 foliaceo-complanatus, erectus aut pendulus, ramosus, vulgo stra- 

 mineus aut stramineo- vel albido-glaucescens aut pallidus, undique 

 fere similaris (aut latere inferiore raro gonidiis destituto), rhizinis 

 veris nullis. Stratum corticate thalli chondroideum, ex hyphis for- 

 matum longitudinalibus [sect. Euramalina Stizenb.] aut trans- 

 versalibus [sect. Desmazieria (Mont.) et Cenozosia (Mass.)] 

 conglutinatis, membrana incrassata et tubulo tenui instructis, in- 

 terdum majore minoreve parte demum fere amorphum. Stratum 

 medullar e stuppeo-arachnoideum aut totum in zonam gonidiaiem 

 reductum, solidum aut cavernosum aut fistulosum, hyphis tenui- 

 bus aut crassis, membrana incrassata et tubulo tenui instructis. 

 Gonidia protococcoidea, globosa, membrana sat tenui. Apothecia 

 marginalia aut lateralia aut apicibus ramorum recurvis evane- 

 scentibusve demum subterminalia, peltata aut cupulaeformia, vulgo 

 straminea aut testaceo-pallida. Excipulum lecanorinum, margine 

 integro aut subintegro, haud radiato, extus strato corticali obdu- 

 ctum chondroideo, ex hyphis formato conglutinatis, membrana in- 

 crassata et lumine tenuissimo instructis. Hypothecium chondroi- 

 deum, ex hyphis crebre contextis conglutinatis formatum, albidum 

 aut pallidum aut subdecoloratum, strato medullari impositum stup- 

 peo aut intus cavo, gonidia et infra stratum corticale excipuli et 



