BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 28. AFD. III. N:0 1. 21 



Dimelcena (Norm.) Stiz. (sectio): E. Stizenberger Beitrag zur Flechten- 

 systematik (1862), p. 169. — Th. M. Fries, Lichenographia scandinavica (1871), 

 p. 192 [excl. R. nimhosa (Fr.) Th. Fr.]. 



Sectio non solum thallo ambitu laciniato-effigurato sed 

 etiam .sporis parvis, mox obscnratis, episporio seqnaliter et 

 haud multum incrassato, apotheciis minutis, thecio minus alto 

 etc. bene distincta. A Fyxine jam sporarum indole et reac- 

 tione IvOH in thecio provocata longe recedit; neque cum 

 speciebus parvis generis Phi/scice confundenda esse mihi videtur. 



Prseter species hoc loco descriptas ad hane sectionem ])ertinent R. oreina 

 (Ach.) Wainio (= Lecanora mougeotcoides Nyl.), R. Hueana Wainio ( = 

 Lecanora oreina Nyl. = Rinodina oreina Mass. sec. Th. M. Fries), R. thy- 

 sanota Tuck. et verisimiliter R. radiata Tuck. 



Excludendse sunt species thallo squanioso v. squamuloso munitse, ex. gr. 

 R. phceocarpa (Fi.oEracE) Wainio [= R. nimhosa (Fr.) Th. Fr.], R. chryso- 

 Dielcena (åch.) Tuck., R. squamulosa Bagl., qute sporis majoribus qnoque a 

 veris Beltraminiis recedunt. 



1. R. MiiUeri Malme n. nom. 



Catolechia tennis Mijll. Arg.; Muller Argov. in Flora 1881, p. 510 

 (non Rinodina tenuis Mull. Arg. Lich. Yatab. (1892), p. 195.). 



Thallus substrato arcte adnatus, centro crustaceus rimoso- 

 areolatus, areolis minutis, planis v. leviter convexis, margi- 

 nem versus lobato-radiatus, radiis subcontinuis contiguisque, 

 augustis (vulgo circiter 0,33 mm. latis), sublinearibus v. apice 

 nonnihil diiatatis, planis v. leviter convexis, fuligineus, fuli- 

 gineo-olivaceus v. brunneolus. Apothecia sat sparsa, adpressa, 

 parva, vulgo 0,i.5 — 0,25 mm. lata; disco atro v. nigricante, 

 opaco, persistenter piano v. demum convexulo; margine tenui, 

 subintegerrimo, primum thallo concolore, dein vulgo nigri- 

 cante v. fuscescente, diu persistente, demum ssepe excluso. 

 Hypothecium pallidum; thecium superne fuligineum v. fusce- 

 scente, KOH colore immutatum. Sporae in ascis inflato-clavatis 

 8:nai, ovoideee v. late oblongfe, nonnumquam medio leviter 

 constrictse, (7 — )9 — 11( — 12) jt* longse, (4— )4,.-. — 5,5( — 6)^t crassai, 

 episporio tenui. 



Crusta KOH immutata; stratum corticale tenue, ex hyphis 

 irregulariter verticalibus, crebre septatis, arcte conglutinatis 

 formatum, parenchymaticum, cellulis subovalibus, circiter '2,i> 

 /t crassis, usque ad 4 jtt longis, inferioribus leptodermaticis, 



