306 E. A. Vainio, Lecideales. 



Rh. amphibium (Fr.) Th. Fr. 



Lich. Scand. Exs. II (1860) n. 45, Lich. Scand. II (1874) p. 630; 

 Koerb. Parerg. Lich. 3 Lief. (1861) p. 232; Arn. Lich. Fragm. XII (Fl. 

 1871) p. 149. Lecidea amphibia Fr. Vet. Ak. Handl. 1822 p. 262, Lich. 

 Suec. Exs. XIII (1827) n. 381, Nov. Sched. Crit. (1827) p. 16, Lich. 

 Eur. Ref. (1831) p. 307. „L. petraea var. (L. amphibia Fr.)" Nyl. Lich. 

 Scand. (1861) p. 234. 



Exs. Fr. Lich. Suec. Exs. XIII (1827) n. 381 (in mus. Paris, et 

 herb. Nyl.). — Th. Fr. Lich. Scand. Exs. II (1860) n. 45 (sec. Th. Fr.). 

 — Havaas Lich. Norv. Occ. Exs. II (1913) n. 46 (in herb, meo), Lich. 

 Norv. Exs. (1914) n. 467 (mus. Fenn.). 



Thallus crustaceus, uniformis, subcontinuus rimosusque aut de- 

 mum areolato-diffractus, areolis difformibus, vulgo verruculoso-inae- 

 qualibus, saepe margine subcrenulatis, caesio-cinerascens, baud prui- 

 nosus, jodo non reagens, hypothallo nigricante saepe limitatus. Apo- 

 thecia vulgo mediocria, thallo immersa et habitu aspicilioidea, aut raro 

 demum leviter subprominentia, disco piano aut raro demum depresso- 

 convexo, baud papillato, nigro, nudo, margine subzeorina aut indistincto 

 aut rarius partim demum lecideino, cinereo-nigricante nigricanteve, 

 tenui. Sporae 8:nae, decolores, long. O.026 — 0.o36, crass. O.oin — O.oie mm, 

 submurali-divisae, cellulis paucis. 



Distr. Ad saxa granitica et gneissacea saepe inundata riparum 

 lacustrium et rivorum in Suecia et Norvegia provenit, sed in Fennia 

 nondum collectum. Specimina Fennica hue relata ad Rh. obscuratum f. 

 amphibolam pertinent. Videas p. 299. 



Habitu aspicilioideo a Rh. obscurato distinguitur et autonoma sit 

 species, jam a Fr. recognita et bene descripta. Thallus modice in- 

 crassatus aut sat crassus, nee KHO, nee addito CaC^OQ reagens. Apo- 

 theeia lat. 1— O.7 (— 1.2) mm, sat crebra aut in lineas aggregata. Para- 

 thecium rubrieoso-fuligineum, tenue aut demum etiam crassum, vulgo 

 thallo immersum et saepe extus baud aut parum visibile. Hypothecium 

 rubricoso- aut fusco-fuligineum. Epithecium rubricosum aut (in Fr. L. 

 S. E. n. 381) olivaceum, see. Th. Fr. etiam smaragdulum. „KHO apices 

 paraphysum, si in violaceum vergunt, violaeeo-rubescunt; aliter colorati 

 non mutantur" (Th. Fr.). Hymenium eirc. O.150 mm crassum. Sporae 

 septis transversis 4—5, loeulis 1—4 septo uno longitudinali divisis. 

 Conidia „acicularia, recta (vel leviter curvula), long. O.ooe — O.009 mm" 

 (Th. Fr.). 



Obs. Rh. amphibium Koerb., Syst. Lich. Germ. (1855) p. 264, 

 sec. exs. eit. et Stizenb. Lich. Helv. p. 201 ad Rh. leptolepidem Anzi 

 speetat. 



