Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 305 



globosa aut subglobosa, simplicia, diam. O.oo? — O.oie mm, vacuolis 

 lateralibus, membrana sat tenui. 



Rh. roridulum Th. Fr. 



Rh. obscuratum *Rh. roridulum Th. Fr. Lich. Scand. (1874) p. 

 629 p. p. 



Thallus crustaceus, uniformis, areolatus, areolis angu- 

 latis, vulgo contiguis, laevigatis, livido- aut subpersicino- 

 cinerascentibus, pruinosis, nee KHO, nee jodo reagentibus, 

 hypothallo indistineto. Apotheeia fere mediocria aut sat 

 parva, vulgo thallum baud superantia aut raro demum 

 leviter prominentia, disco piano aut raro demum depresso- 

 convexo, pruinoso (aut denudato ?), baud papillato, margine 

 sat tenui aut demum attenuato, persistente, nigro nudoque 

 aut pruinoso. Epithecium rubricosum. „Sporae 8:nae, de- 

 coloratae, interdum demum leviter olivaceae, long. O.020 — O.040, 

 crass. 0.012 — 0.022 mm" (sec. Th. Fr.). 



Distr. „Ad rupes regionum alpinarum borealiumque 

 in Suecia et Norvegia", etiam „ad Nyborg et Mortensnaes 

 in Finmarkia orientali" (sec. Th. Fr.). Speciminibus certe 

 determinabilibus in Fennia nondum collectum. 



Haec species a Th. Fr. non sit rite limitata, quare earn 

 sec. specimen typicum, in ins. Tromsoe a Norm, collectum, hie 

 descripsimus. — ThaHus modice incrassatus („interdum fere 

 obsoletus" sec. Th. Fr.), areolis circ. O.4— 1.5 mm latis, KHO cum 

 CaClgOg non reagentibus. Apotheeia lat. saepe 0.8 — O.9 (O.5 — 1) 

 mm („pruina nunc densa, nunc tenuis, nunc nulla" sec. Th. Fr.), 

 stratis coloratis KHO rubricoso-violascentibus. Perithecium rubri- 

 coso-fuligineura aut intus partim dilutius coloratum. Hypothecium 

 fuscum aut rubricoso-fuligineum. Hymenium circ. O.160 — O.180 mm 

 crassum. Epithecium rubricosum aut rubricoso-fuligineum. Para- 

 physes gelatinam modice abundantem percurrentes, cellulis sub- 

 oblongis ellipsoideisve, crass. O.002 — O.0025 mm, apice parum 

 incrassatae. Sporae submurales, septis transversis circ. 4 — 7, 

 cellulis baud numerosis, demum morbose nigricantes. Gonidia 

 cystococcoidea, simplicia, globosa aut subglobosa aut parcius 

 etiam ellipsoidea. 



20 



