20 ARKIV FÖR BOTANIK. BAND (S. N:0 4. 



Behr. (1888) p. 7, secundum specimen nr. 36813 in herb. Nyl. 

 ad R. scopariam spectat. 



In latere meridionali-occidentali rupis in peninsula Jin- 

 retlen. Ster. 



4. Cetraria. 



Subg. 1. Stigmatophora Wain. 



Thallus maculis vel zonis (in C. Richardsonii Hook.) de- 

 corticatis, h. e. pseudocyphellis, in latere inferiore sitis, soredia 

 nulla, at materiam subalbidam, granulosam formantibus, in- 

 structus. Ad hoc subgenus species sequentes pertinent: Ce- 

 traria I slandica (L.) Ach., C. hiascens (Fr.) Th. Fr., C. Richard- 

 so7iii Hook., C. leucostigma Lev., C. rhytidocarpa Mont., C. 

 melalo7na (Nyl.), C. Yunnana (Nyl.), C. ineiojjhora (Nyl.), C. 

 citrina Tayl., C. complicata Laur., C. reticidata Krempelh., 

 C. Wallachiana (Tayl.), C. Strachei Bab. et C. 7iephro7noides 

 (Nyl.). Genus N ephromiopsis Müll. Arg., Lieh. Beitr. (Fl. 

 1891) n. 1623, Hue, Lieh. Extra-Eur. (1901) p. 216, apothe- 

 ciis in summo margine thalli formatis, demum obliquis resupi- 

 natisque dignota, pro parte ad subg. Stig^natophoram [C. 

 Strachei, C. nephromoides], pro parte ad subg. Eucetrariam 

 [C. ciliaris Ach., C. cucidlata (Bell.) Ach.] pertinet, species 

 haud affines amplectens. 



1. C. Islandica (L.) Ach., Meth. Lieh. (1803) p. 293; 

 Th. Fr., Lieh. Scand. (1871) p. 98; Nyl., Lieh. Midden- 

 dorff. (1874) p. 2; Almqu., Lieh. laktt. Sib. (1879) p. 35, 37, 

 46, 47, Lieh. Kust. Beringsm. (1887) p. 520, 521, 523, 528, 

 533, 537, 541; Nyl., Enum. Lieh. Fret. Behr. (1888) p. 44, 62; 

 Zopf, Zur Kenntn. Flechtenstoffe X (J.Liebig's Annal. der 

 Chem. 324, 1902) p. 52; Hesse, Beitr. Kennt. Flecht. Be- 

 standt. VIII (Journ. prakt. Chem., Neue Folge, 68, 1903) p. 

 26, IX (70, 1904) p. 455, X (73, 1906) p. 141. Lichen I slandicus 

 L., Spec. PL (1753) p. 1145 pr. p.; conf. Wain., Rev. Lieh. 

 Linn. (Meddel. Soc. Faun. Fl. Fenn. XIV, 1886) p. 4. 



Var. rigida (Retz.) Wain. Lichen Islandicus a. rigidus 

 Retz., Fl. Scand. Prodr. (1779) p. 227. C. Islandica a. vulgaris 

 Seller.; Hepp, Flecht. Eur. (1853) n. 169 (Schter., Spic. Lieh. 

 Helv., 1823, p. 11, 1833 p. 253). 



