310 E. A. Vainio, Lecideales. 



Distr. Loco subumbroso in latere rupis graniticae ad Kalliovaara 

 in par. Lieksa in Kb. (Vain.). 



Thallus areolis depresso-convexis, saepe nonnullis confluentibus, 

 KHO lutescentibus, dein rubescentibus, jodo non reagentibus. Epi- 

 thecium olivaceo-nigricans vel aeruginoso-subfuscescenti-fuligineum. 

 Sporae decoloratae. 



17. Rh. distinctum Th. Fr. 



in Falk Ostr. Blek. Laffl. (1874) p. 16, Lich. Scand. II (1874) p. 625; 

 Arn. Lich. Munch. (1891) p. 94, Lich. Fragm. 35 (Oesterr. Bot. Zeitschr. 

 1896) p. 33. Lecidea distincta Stizenb. Lich. Hyperb. (1876) p. 47; Nyl. 

 Lich. Paris (1896) p. 102; Vain. Lich. Caucas. (1899) p. 319. L. petraea 

 var. fuscoatra Plot. Bot. Zeit. 1828 p. 690 (L. atroalba v. fuscoatra Plot. 

 Lich. Schles., 1829, p. 8, Lich. Exs., 1829, n. 172 A, sec. n. 9865 in herb. 

 Nyl.; L. atroalba „saepe L. fuscoatra dicta" Pr. Nov. Sched. Crit, 1827, 

 p. 17 n. 382 B p. p., sec. Arn. Lich. Prank. Jur., 1884, p. 200). L. atro- 

 alba V. fuscoatra b. dendritica Plot. Lich. Schles. (1829) p. 8, Lich. Exs. 

 (1829) n. 172 B (sec. Arn. 1. c). L. confervoides i]. dendritica Schaer. 

 En. Lich. Eur. (1850) p. 113 (citantur Plot. Lich. Exs. n. 172 B, Verr. 

 dendritica Hoffm. incogn.). L. confervoides ,i. areolata Schaer. En. Lich. 

 Eur. (1850) p. 113 (sec. Hepp Plecht. Eur. n. 36, sed react, nonduni 

 cogn.). L. atroalba a. ambigua Naeg. in Hepp Plecht. Eur. I (1853) 

 n. 36 (conf. p. 311). Rh. atroalbum Arn. Lich. Pragm. XII (PI. 1871) 

 p. 148. 



Exs. Fr. Lich. Suec. Exs. XIII n. 382 B p. p. (sec. Arn. 1. c, Th. 

 Fr. 1. c. p. 614). — Schaer. Lich. Helv. Exs. VIII (1828) n. 178 p. p. 

 (sec. Arn. 1. c, Th. Pr. 1. c. p. 626). — Plot. Lich. Exs. (1829) n. 172 

 A, B p. p. (videas supr.). — Hepp Plecht. Eur. I (1853) n. 36 (sec Arn. 

 et Stizenb.). — Fellm. Lich. Arct. (1864) n. 196. — Arn. Lich. Exs. (1875) 

 n. 635 a, b, (1888) n. 1397. — Zwackh Lich. Exs. (1880) n. 607. — Lojka 

 Lich. Hung. Exs. IV (1882). — Malme Lich. Suec. Exs. I (1897) n. 15, 

 VII (1910) n. 173. — Zahlbr. Krypt. Exs. Vindob. Ill (1898) n. 263 a, b. 



Thallus crustaceus, uniformis, areolatus, areolis planis 

 aut raro leviter convexis, minutis, tenuibus, cinereo-fusce- 

 scentibus aut raro cinereis, baud pruinosis, dispersis aut 

 partim contiguis, KHO non reagentibus, medulla alba, jodo 

 leviter violascente, hypothallo nigro. Apothecia minuta, 

 nigra, nuda, plana aut planiuscula, tenuiter marginata aut 

 immarginata. Epithecium vulgo pruinosum. Sporae 8:nae, 

 decoloratae aut detnum leviter obscuratae, submurales, long, 

 0.024 — 0.0.32, crass. O.on — O.ois mm sec. Th. Fr. (long. — O.045, 

 crass. — 0.021 mm sec. Flagey Cat. Lich. Alg., 1896, p. 80). 



