22 ARKIV FÖR BOTANIK. BAND 8. N:0 -t. 



cellularum subglobosis, sat latis (circ. 0,007 — 0,005 millim. 

 latis); stratum corticale interiiis vulgo paullo aut vix tenuius 

 (circ. 0,020 millim. crassum), ex hyphis formatum irregulariter 

 contextis, conglutinatis, pachydermaticis, haud distincte limi- 

 tatis, lumine angustissimo instructis. To tum stratum corti- 

 cale circ. 0,050 — 0,060 millim. crassum. Stratum medulläre 

 ex hyphis formatum sat crebre contextis, circiter 0,004 millim. 

 crassis, sat leptoderm.aticis. Maculae albidse vel pseudocyphel- 

 lae strato corticali destitutae, at strato tenuissimo, ex 

 hyphis crebre contextis, leviter conglutinatis, pachydermaticis, 

 lumine minuto cellularum instructis formato, materia granu- 

 losa, amorpha, neque KHO, nec spirito vini, nec ClHdissoluta, 

 insperso, obductae. Gonidia ad Cystococcu^n humicolam perti- 

 nentia. 



2. C. hiascens (Fr.) Th. Fr., Lieh. Scand. (1871) p. 

 98; Almqu., Lieh. laktt. Sib. (1879) p. 34, 35, 37, 45, 46, Lieh. 

 Kust. Beringsm. (1887) p. 521, 524, 528, 535, 537, 541; Cromb., 

 Mon. Lieh. Brit. (1894) p. 217. C. aculeata ß. hiascens Fr., 

 Lieh. Eur. Ref. (1831) p. 36. C. Islandica o. Delisei Bory in 

 SchiTer., Enum. Lieh. Eur. (1850) p. 16; Nyl., Syn. Lieh. (1858— 

 60) p. 299; Th. Fr., Lieh. Aret. (1860) p. 35; Nyl., Lieh. vScand. 

 (1861) p. 79; Tuck., Syn. North Am. Lieh. (1882) p. 31; Cumm., 

 Lieh. Alaska (1904) p. 145. C. Delisei Th. Fr., Lieh. Spitsb. 

 (1867) p. 11; Nyl., Lieh. Lapp. Or. (1866) p. 114, Lieh. Midden- 

 dorff. (1874) p. 4, Enum. Lieh. Fret. Behr. (1888) p. 19, 44, 

 53, 62: Norrl., Berätt. Torn. Lappm. (1873) p. 322: Wain., 

 Adj. Lieh. Lapp. I (1881) p. 119; Hue, Addend. Lieh. Eur. 

 (1886) p. 36, Lieh. Exot. (1892) p. 65. 



Var. dilatata Wain. 



Thallus laciniis dilatatis. circ. 17 — 2,5 millim. latis, appla- 

 natis aut partim concavis, apicibus late rotundato-lobatis, 

 rhizinis destitutus, papillis elevatis et spinulis brevibus passim 

 parce marginibus laciniarum affixis, maculis decorticatis albi- 

 dis cinereisve impressis in latere inferiore instructus. Analoga 

 est var. rigidae C. Islandicae et facile cum ea eommixta. — 

 Medulla jodo non reagens. Partibus emorientibus in basi 

 thalli pallidis aut obscuratis, haud rubescentibus. Thallus in 

 nullis speeiminibus a me examinatis C. hiascentis CaCUOj rea- 

 gens. 



