Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 333 



Thallus crustaceus, uniformis, subcontinuus aut rimoso- 

 diffractus areolatusve aut raro verrucosus, aut dispersus, 

 cinerascens aut lividus pallidusve aut rufescens, baud prui- 

 nosus, esorediatus, nee KHO, nee jodo reagens, hypothallo 

 nigricante. Apothecia vulgo mediocria, thallum baud supe- 

 rantia aut demum prominentia, nigra, nuda, disco piano, baud 

 papillato, margine tenui aut modice incrassato, persistente 

 aut demum excluso. Epitbecium olivaceum aut aerugino- 

 sum. Sporae 8:nae, decoloratae aut demum obscuratae, 

 vulgo long. circ. O.oio — O.029, crass. O.009 — O.ou mm, 1-sep- 

 tatae. 



Distr. Supra rupes et saxa, granitica, gneissacea, 

 porpbyrica, dioritica, passim, septentrionem versus rare- 

 scens. 



F. colludens (Nyl.) Vain. L. colludens Nyl. Fl. 1870 p. 38 p. p. 

 (sec. determ. et specim. cit. in herb. Nyl.). I. Hochstetteri var. collu- 

 dens Vain. Adj. Lich. Lapp. II (1883) p. 132. Catocorpus Hochstetteri 

 Koerb. 1. c. (conf. Stizenb. Lich. Helv., 1882, p. 200j. Rh. applanatum 

 f. Hochstetteri Th. Fr. 1. c. p. 619. 



Exs. Havaas Lich. Norv. Exs. (1904) n. 202. — Norrl. et Nyl. Herb. 

 Lich. Fenn. cont. (1921) n. 728. 



Thallus tenuis vel tenuissimus, laevigatus, continuus rimulosusve 

 aut dispersus, rufescens aut pallidus aut subcervinus. Apothecia mar- 

 gine tenui. 



Distr. Praesertim in lateribus subumbrosis rupium saxorumque 

 crescit. In provinciis meridionalibus et adhuc in Karelia boreali passim. 

 In Ekostrov ad Imandra in LIm. (N.I. Fellman). 



Apothecia lat. 1 2— O.5 mm, thallum baud superantia aut prominentia. 

 Perithecium rubricoso-fuligineum. Hypothecium sordide purpureo- aut 

 fusco-fuligineum. Hymenium circ. O.ioo mm crassum, sat parce gelati- 

 nosum. Epithecium aeruginoso-fuligineum. Sporae decoloratae aut 

 demum dilute aeruginoso- aut subfuscescenti-obscuratae, long. O.ois — 

 0.025, crass. O.oio— O.012 mm (sec. Nyl.), strato gelatinoso tenui indutae. 

 Conidia „bacilliformia, recta, long. O.0035 — O.oooe, crass. O.0005 mm" (sec. 

 annot. Nyl. in n. 10047 et 10070). 



F. caesiocinerascens Vain. L. Hochstetteri f. caesiocinerascens 

 Vain. Adj. Lich. Lapp. II (1883) n. 132. 



Thallus tenuis, laevigatus, subcontinuus, rimulosus, cinerascens. 

 Apothecia margine tenui. 



