230 



HKKNT I.YNCE. M.-N. Kl. 



Nordl. Nær«) (Nokm.I, S;ilulal<ii iiiaxiiii.i, ')|)tiin'- friirtif. (Somuft. s. n. 

 I '. f)/i(fil(i), Soiiolla: Djiipvik (Norm.), Of'oten : hivenes (Norm.). 'Ironis. 

 Tromso (NoKM., 1). I..), /■'iiiiii. 'I ana: CliilllKilnun, miserably developed (Ij. L.|. 



/ 'siicd sorcdiifrra is the nK)st widely distributed I snca in our country, 

 and one of the most frequent ones. It ascends from the level of the sea 

 to the u|)per forest liiiiil, and northwarrls it advances to Tromsø as a quite 

 common |)lanl. 



It prefers the branches of deciduous trees [Bctiild, Jdgiis, (Jitcrciis), 

 hut it is also found on Conifers, and on th(; coast on mossy rocks. 



Usiira sorcdiifda is well separated from C.flnridd b\- its soredia, it 

 has also more slender branches, and it is usually sterile. It is much more 

 difficult to distinguish it from U. Iiitia, and these two species should per- 

 haps be united. I have little to add to the characters stated by AcHAkiL'S 

 Lieh, llniw p. 624: 'abhac' (i. e. coinosa; our sored i if era) 'parum differt no.stra 

 liirla. X'arietas coinosa dignoscitur tamen thallo proceriori albo pallescente 

 ct summitatibus ramulorum tantum scabriusculis. Varietas liirta plerumque 

 huniilioi- per aetatem sordide cinerascens magis intricata et undique pulveru- 

 lento-scabriuscula". 



Apothecia i\ara, ([uam in I'.Jhnida minora, diam. 3 — 5(7! mm., fibril- 

 losa, librillae subtenerae, discus flavo-virescens, tenuiter pruinosus. Cortex 

 25 — 50 [V-, hyphae valde pachydermaticae, parte exteriore adspersae. Epi- 

 thecium flavescens, valde inspersum. Hymenium angustwn: 30 — 45 [j.; 

 paraphyses conglutinatae, apice baud vel parce incrassatae, septatae, vulgo 

 indivisae; asci pyriformes, octospori. Sporne parvae, obloiigae: 5.2 — 8.4 — 

 ( 10) 4.2 6.6 \u 



1-leact. f^ymenium J e caeruleo + sordide decoloratur, asci et hy- 

 menium j persistenter caerulescentia. Thallus KOH + intense flavescens 

 (praecipue soredia), dein vulgo rubescens. 



Usiiea florida has larger and more ellipsoid spores; 1 have measured 

 in Norwegian plants: 9 — 13 ' 5-5 — 8 [x (Crombie: 7 — 11 x6 — 7 [/.), a higher 

 hymenium (up to 65 \i.], and coarser paraphyses. 



5. Usnea fragilescens Havaas. 



Map III, I. 



Thallus flavescens vel virescenti-flavescens, basi vulgo obscuratus, pa 

 tens vel erectiusculus, brevis vel mediocris: 3 — 5, rarius usque 8 cm. longus, 

 fragil is, usque a basin iteratim divergenter ramosus vel etiam patento- 

 ramosus, cortex crebre transversim ruptus, rami majores con- 

 stricte affixi, articulati, articulis utroque apice .attenuatis. Caules 

 Primarii robusti, usque 2 mm. crassi, ramulique divergenter fibrillosi et 

 papilloso -sc abrosi, ramuli soredi oso-fa ti scent es, soredia inter- 

 dum propagula erectula emittentia (ut in Alectoria iiidiiliferci). 



