Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 153 



0.2 ( — O.3) mm lato nigro denudatoque, rufescenti-pallido 



in lamina tenui, ceterum amphithecio thallino obductum. 



Paraphyses numerosae, simplices aut parcissime ramoso- 



connexae. Asci vulgo subcylindrici. Sporae 8:nae, distichae, 



fusiformes, apicibus sat obtusis, murales, long. O.024 — O.034, 



crass. O.007 — O.ou mm. Gonidia pleurococcoidea. 



Distr. Supra muscos et Cladonias destructa in rupibus 



et ad terram montium rara. Ostrobotnia bor.: Ii (F. Silen), 



Alkula (J. P. Norrlin). Kuusamo: In reg. subalpina montis 



Iivaara (Vain.), in Kuusamo etiam a F. Silen lecta. Lapponia 



Kemensis: In reg. subalpina montis Pyhatunturi in par. 



Sodankyla (Vain.), in Muonio et Valivaara (Norrl.). Lapponia 



Murmanica: Varsina (N. I. Fellman). 



Thallus „KHO leviter flavescens, CaCl 2 2 non reagens, jodo 

 fulvescens" sec. Arn. 1. c. Amphithecium gonidia parce continens. 

 Nucleus haud guttulosus, albidus, jodo sat dilute caerulescens, 

 dein vulgo subdecoloratum, metaplasmate haud rubescente. Asci 

 long. circ. O.100 — O.120, crass. O.020 mm, in apice membrana modice 

 incrassata. Paraphyses crass. O.0007 mm. Sporae distichae, cellulis 

 demum numerosis, in circ. 9 seriebus transversis, membrana sat 

 tenui, haud gelatinosa, jodo non reagentes. 



2. Th. corrosa (Koerb.) Vain. 



Limboria corrosa Koerb. Syst. Lich. Germ. (1855) p. 376, Garov. 

 et Gib. Thelops. (1867) p. 10, tab. II f. 3. Microglaena Arn. Lich. Tirol 

 XVII (1877) p. 555, Lich. Frank. Jur. (Fl. 1885) p. 266; A. Smith Mon. 

 Brit. Lich. (1911) p. 309; Jatta Fl. It. Crypt. Lich. p. 846. Verrucaria 

 Vain. Adj. Lich. Lapp. II (1883) p. 182. Dermatocarpcn arenarium (Hampe 

 in litt.) Koerb. Par. Lich. 4 Lief. (1863) p. 309 (Fl. 1866 n. 7, 8). Verru- 

 caria arenaria Arn. Fl. 1867 p. 119, Nyl. in Vain. Fl. Tav. Or. (1878) p. 

 120. Microglena Nericiensis Hellb. Nerikes Laffl. (1871) p. 123. 



Exs. Arn. Lich. Exs. (1862) n. 201 a, b, c. — Koerb. Lich. Sel. 

 Germ. X (1864) n. 297 (sec. Arn.). — Norrl. et Nyl. Herb. Lich. Fenn. 

 II (1875) n. 99. — Zwackh Lich. Exs. (1880) n. 620. 



Thallus vulgo sat tenuis aut evanescens, interdum sat 

 crassus, verrucosus aut verruculosus frustulosusve, dispersus, 

 albidus aut glaucescens vel cinerascens. Apothecia sparsa, 

 verrucis frustulisve thalli difformibus irregularibusque 

 immersa aut verrucas formantia circ. 0.5 — O.2 mm latas, 

 subglobosas, basi praeruptas aut sensim dilatatas aut raro 



